Crossword Genius

Succeed with sex? Don’t be daft! (4,3,2)

Ross

I believe the answer is:

come off it

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

'don't be daft' is the definition.
I can't tell whether this defines the answer.

'succeed with sex?' is the wordplay.
'succeed' becomes 'comeoff' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'sex?' becomes 'it' (a common euphemism).
'comeoff'+'it'='COME OFF IT!'

Can you help me to learn more?

(Other definitions for come off it that I've seen before include "Stop messing about!" , "Don't talk rubbish" , "Stop being so stupid!" , "People climbing dangerous structure may be told to" , "stop fooling" .)

I've seen this clue in The Guardian.
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