Is even more compact if it's a Mini (4)
I believe the answer is:
disc
'even more compact if it's a mini' is the definition.
I can't judge whether this defines the answer.
'is' is the wordplay.
I cannot quite see how this works, but
'is' is within the answer.
The remaining letters 'dc' 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 disc that I've seen before include "In Olympic event" , "Protein-constituent acid" , "put on by jockey?" , "Back part" , "Capital of India" .)