Led a nun astray but not charged! (7)
I believe the answer is:
unladen
'not charged' is the definition.
(I've seen this before)
'led a nun astray' is the wordplay.
'astray' indicates anagramming the letters.
'led'+'a'+'nun'='ledanun'
'ledanun' anagrammed gives 'UNLADEN'.
'but' acts as a link.
(Other definitions for unladen that I've seen before include "not carrying goods" , "Not carrying a cargo" , "not charged" , "without cargo" .)