Crossword Genius

Stop talking, understood? (9)

Ross

I believe the answer is:

saynomore

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

'talking understood?' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'stop' is the wordplay.
I cannot really see how this works, but
'stop' could be 'nomore' (I've seen this in another clue) and 'nomore' is found in the answer.
The remaining letters 'say' is a valid word which might be clued in a way I don't see.
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 Daily Express.
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