Sally's love for getting into the fight! (5)
I believe the answer is:
foray
'sally's' is the definition.
(I've seen this in another clue)
'love for getting into the fight' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'for getting into' is an insertion indicator.
'the fight' becomes 'fray' (fray is a kind of fight).
'o' inserted inside 'fray' is 'FORAY'.
(Other definitions for foray that I've seen before include "Raid into enemy territory" , "Depredation" , ".A sudden attack or raid" , "Assault" , "Raid or incursion" .)