Get cracking small dish (5)
I believe the answer is:
start
'get cracking' is the definition.
(I've seen this in another clue)
'small dish' is the wordplay.
I cannot quite see how this works, but
'small' could be 's' (abbreviation - e.g. clothes size) and 's' is present in the answer.
The remaining letters 'tart' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for start that I've seen before include "Begin - opening move" , "Beginning" , "Jump suddenly" , "Take the first step" , "Commencement" .)