He'd rob a poor girl (7)
I believe the answer is:
deborah
'girl' is the definition.
'he'd rob a poor' is the wordplay.
'poor' indicates anagramming the letters.
'hed'+'rob'+'a'='hedroba'
'hedroba' anagrammed gives 'DEBORAH'.
(Other definitions for deborah that I've seen before include "Biblical prophetess" , "Girl" , "Deb's full name" , "Judge" , "Handel work; girl's name" .)