Allow too little space for muscular contraction (5)
I believe the answer is:
cramp
'for muscular contraction' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for cramp that I've seen before include "To restrict; a muscle pain" , "Painful muscle problem" , "restraint" , "Involuntary muscular contraction" , "Involuntary and painful contraction of a muscle" .)