Hiding pain when husband parts (8)
I believe the answer is:
stashing
'hiding' is the definition.
(I've seen this in another clue)
'pain when husband parts' is the wordplay.
'pain' becomes 'sting' (sting is a kind of pain).
'when' becomes 'as' (eg 'when I walked' means 'as I walked').
'husband' becomes 'h' (abbreviation).
'parts' indicates putting letters inside (one word creates a gap in ie parts another word).
'as'+'h'='ash'
'sting' enclosing 'ash' is 'STASHING'.
(Other definitions for stashing that I've seen before include "Storing in a secret place" , "stocking, secretly" , "Stowing away" .)