You won't hear my bark! (4)

I believe the answer is:

tree

I'm a little stuck... Click here to teach me more about this clue!

'bark' is the definition.
The answer and definition can be both plants as well as being singular nouns.
Maybe you can see an association between them that I can't see?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for tree that I've seen before include "famous actor" , "Tall, woody plant" , "eg Rowan" , "Tall perennial plant" , "Diagram representing different relationships" .)

I've seen this clue in The Sun.

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