Straining to accept husband moving (8)
I believe the answer is:
shifting
'moving' is the definition.
(shifting is a kind of moving)
'straining to accept husband' is the wordplay.
'straining' becomes 'sifting' ('sift' can be a synonym of 'strain').
'to accept' is an insertion indicator.
'husband' becomes 'h'.
'sifting' placed around 'h' is 'SHIFTING'.
(Other definitions for shifting that I've seen before include "Not remaining motionless" , "Moving" , "Changing position or direction" .)