White magic involving couple (4)
I believe the answer is:
item
'couple' is the definition.
(a romantic couple are 'an item')
'white magic involving' is the wordplay.
'involving' says the answer is hidden in the clue (I've seen 'involves' mean this).
'ITEM' is hidden within 'white magic'.
(Other definitions for item that I've seen before include "Part of a list" , "A thing or unit" , "Bit of information" , "Feature" , "Record" .)