Pious Tina sadly is taken in by cunning (7)
I believe the answer is:
saintly
'pious' is the definition.
(thesaurus)
'tina sadly is taken in by cunning' is the wordplay.
'sadly' indicates an anagram.
'is taken in by' indicates putting letters inside.
'cunning' becomes 'sly' ('sly' can be a synonym of 'cunning'**).
'tina' anagrammed gives 'aint'.
'aint' placed into 'sly' is 'SAINTLY'.
(Other definitions for saintly that I've seen before include "good!" , "Beatific" , "Very virtuous" , "Very holy" .)