Make it clear you can never quite finish feeding? (6)

I believe the answer is:

define

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'make' is the definition.
The answer and definition 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 don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for define that I've seen before include "State the meaning of" , "Give precise meaning" , "Characterise" , "Fix the meaning of" , "Explain the meaning of a word" .)

I've seen this clue in the Evening Standard.

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