Crossword Genius

Feel sleepy and indicate acquiescence (3)

Ross

I believe the answer is:

nod

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

'acquiescence' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'feel sleepy and indicate' is the wordplay.
I cannot quite understand how this works, but
'and' could be 'n' (common abbreviation for 'and') and 'n' is present in the answer.
The remaining letters 'od' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for nod that I've seen before include "Gesture of acceptance" , "Bob the head" , "Move head in agreement" , "Indicate agreement (or sleepiness!)" , "Incline the head" .)

I've seen this clue in The Irish Independent.
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