Crossword Genius

Allow too little space for muscular contraction (5)

Ross

I believe the answer is:

cramp

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'for muscular contraction' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

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(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" .)

I've seen this clue in The Irish Independent.
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