Goose's reply to what the pig said? (4)

I believe the answer is:

oink

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'goose's reply' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their base form.
Maybe there's an association between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for oink that I've seen before include "Sow's sound" , "What you get from pen" , "Pig's noise" , "Sound made by a pig" , "Animal sound" .)

I've seen this clue in the Evening Standard.

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