Separating without husband moving (8)
I believe the answer is:
shifting
'separating without husband moving' is the definition.
I can't judge whether this definition defines the answer.
'separating without husband moving' is the wordplay.
'separating' becomes 'sifting' (sifting is a kind of separating).
'without' indicates putting letters inside ('without' can be similar in meaning to 'outside').
'husband moving' becomes 'h' (I can't justify this - if you can you should give a lot more credence to this answer).
'sifting' enclosing 'h' is 'SHIFTING'.
Can you help me to learn more?
(Other definitions for shifting that I've seen before include "Changing position or direction" , "Not remaining motionless" , "Moving" .)