[Python] Issue with updating plot in tkinter TopLevel using matplotlib FigureCanvasTkAgg

I am trying to use below code to update the plot in matplotlib FigureCanvasTkAgg embedded in tkinter TopLevel window.

import tkinter as tk
from matplotlib.backends.backend_tkagg import (FigureCanvasTkAgg, NavigationToolbar2Tk)
from matplotlib.figure import Figure

def toplevelfunc():
global fig, ax, canvas
top = tk.Toplevel()

## Widgets (Run Button, Entry Field) to select a file from which graph has to be plotted on canvas
## Run button function which passes file to be plotted "plot_data"

result_frame = tk.Frame(top)
result_frame.grid(column = 0, row = 3, sticky='NSEW', padx = (15,15), pady = (5, 5), columnspan=3)

fig = Figure(figsize=(10, 5), dpi=100)
ax = fig.add_subplot(111)
fig.subplots_adjust(bottom=0.016, right=0.98, top=0.98, left=0.075, wspace=0, hspace=0)

ax.set_aspect('auto')
ax.set(title="",xticks=[], yticks=[])
ax.spines["top"].set_visible(False)
ax.spines["right"].set_visible(False)
ax.spines["left"].set_visible(False)
ax.spines["bottom"].set_visible(False)

canvas = FigureCanvasTkAgg(fig, master=result_frame)
canvas.draw()

toolbar = NavigationToolbar2Tk(canvas,result_frame)

toolbar.update()
toolbar.pack(side=tk.TOP, fill=tk.X, padx=0)

canvas.get_tk_widget().pack(side=tk.TOP, fill=tk.BOTH, expand=1, padx=10)

canvas._tkcanvas.pack(side=tk.TOP, fill=tk.BOTH, expand=1, padx=5)

def plot_data(file):
global fig, ax, canvas
ax.clear()

## Code to plot the file data

ax.set_aspect('auto')
# ax.set(title="",xticks=[], yticks=[])
ax.spines["top"].set_visible(False)
ax.spines["right"].set_visible(False)
ax.spines["left"].set_visible(True)
ax.spines["bottom"].set_visible(True)

canvas.draw()


The issue which I am facing is that plot is getting updated in the FigureCanvasTkAgg but it is not occupying the complete canvas area and old plot is not getting cleared because of which I am observing overlapping plots.

Can someone let me know how to resolve it.

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