Crossword Genius

Show no sign (4,3,6,4)

Ross

I believe the answer is:

give the thumbs down

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

'show' is the definition.
Both the answer and definition are verbs in their base form.
Perhaps you can see an association between them that I can't see?

'no sign' is the wordplay.
I cannot really understand how this works, but
'no' could be 'o' (resembles 0 - 'no' can mean 'zero') and 'o' is present in the answer.
'sign' could be 'heth' (heth is a kind of sign) and 'heth' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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