Girl’s deceit taking Charlie in (6)
I believe the answer is:
lassie
'girl's' is the definition.
(lassie is a kind of girl)
'deceit taking charlie in' is the wordplay.
'deceit' becomes 'lie' (I've seen this in other clues).
'taking charlie' becomes 'ass' (both can mean a foolish person. I am not sure about the 'taking' bit.).
'in' indicates putting letters inside.
'lie' going around 'ass' is 'LASSIE'.
(Other definitions for lassie that I've seen before include "TV/film dog" , "TV series/film dog" , "Scots girl - film dog" , "Young Scottish girl or Hollywood lost dog" , "girl found" .)