Creeps in Red Square? Just the leader (6)
I believe the answer is:
inches
'creeps' is the definition.
(I've seen this in another clue)
'in red square? just the leader' is the wordplay.
I cannot really see how this works, but
'in' is found in the answer.
'red' could be 'che' (as in Che Guevara, a communist or 'red') and 'che' is found within the answer.
'square?' could be 's' (abbreviation) and 's' is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for inches that I've seen before include "small amount" , "Moves in small steps" , "Twelves of these in a foot" , "Islands; measurements" , "Imperial units of length" .)