Prophet takes husband to be transparent (5)
I believe the answer is:
sheer
'be transparent' is the definition.
(synonyms)
'prophet takes husband' is the wordplay.
'prophet' becomes 'seer' (both can mean someone who tells the future).
'takes' is an insertion indicator.
'husband' becomes 'h' (abbreviation).
'seer' enclosing 'h' is 'SHEER'.
'to' acts as a link.
(Other definitions for sheer that I've seen before include "Very thin and fine" , "Arrant" , "Very thin; unmitigated" , "Downright - deviation" , "Steep; fine" .)