Girl’s pulling power, a diversion (11)
I believe the answer is:
distraction
'a diversion' is the definition.
(distraction is a kind of diversion)
'girl's pulling power' is the wordplay.
'girl' becomes 'dis' (I've seen this in other clues).
'pulling power' becomes 'traction' (I've seen this before).
'dis'+'traction'='DISTRACTION'
(Other definitions for distraction that I've seen before include "Agitated mental state" , "It stops one concentrating" , "Amusement" .)