A kind of dance? Go slowly if necessary (2,1,5)
I believe the answer is:
at a pinch
'if necessary' is the definition.
(at a pinch means if required)
'a kind of dance? go slowly' is the wordplay.
I cannot quite see how this works, but
'a' is found in the answer.
'dance?' could be 'tap' (tapping dance is a kind of dancing) and 'tap' is found in the answer.
The remaining letters 'inch' 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?
(Other definitions for at a pinch that I've seen before include "In case of necessity" , "in case of emergency" , "In time of difficulty or necessity - nip it" , "in a crisis?" , "under pressure" .)