Bend over with cramp partly returning (4)
I believe the answer is:
arch
'bend over' is the definition.
(I've seen this before)
'with cramp partly returning' is the wordplay.
'partly' indicates a hidden word (part of the clue is used).
'returning' is a reversal indicator.
'hcra' is hidden within 'with cramp'.
'hcra' back-to-front is 'ARCH'.
(Other definitions for arch that I've seen before include "Supporting structure" , "Curved vault" , "Knowing, coy" , "one under a foot?" , "one that may have fallen" .)