Constrain (5)

I think it could be either:

Which length description are you looking for?:

cramp

'constrain' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for cramp that I've seen before include "hamper" , "Muscle spasm" , "Form of muscular pain" , "Severe muscular pain" , "Muscular spasm, very painful" .)

I've seen this clue in The Independent.

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