Looked agreeable, if perhaps sleepy (6)

I believe the answer is:

nodded

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'looked' is the definition.
The answer and definition can be both related to bodily activities as well as being past participle verbs.
Perhaps there's a link between them I don't understand?

I don't understand how the rest of the clue works.

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(Other definitions for nodded that I've seen before include "Bent the head in sleepiness" , "Made a mistake" , "Agreed - dropped off" , "Made head movement by way of assent" , "signed agreement" .)

I've seen this clue in the Evening Standard.

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