Mere husband taken in by prophet (5)
I believe the answer is:
sheer
'mere' is the definition.
(thesaurus)
'husband taken in by prophet' is the wordplay.
'husband' becomes 'h'.
'taken in by' means one lot of letters goes inside another.
'prophet' becomes 'seer' (I've seen this before).
'h' placed into 'seer' is 'SHEER'.
(Other definitions for sheer that I've seen before include "Diaphanous, filmy" , "avoid an unpleasant thing" , "Unqualified" , "(Of fabric) very thin" , "Arrant" .)