Deal with English, entering fight without heart (3,2)
I believe the answer is:
see to
'deal' is the definition.
(thesaurus)
'with english entering fight without heart' is the wordplay.
'with english' becomes 'e' (abbreviation. I am not sure about the 'with' bit.).
'entering' indicates putting letters inside.
'fight' becomes 'setto' (set-to can mean a fight or argument).
'without heart' means to remove the middle letters.
'setto' with its centre removed is 'seto'.
'e' put within 'seto' is 'SEE TO'.
(Other definitions for see to that I've seen before include "Look after" , "Sort out" , "handle" , "Deal with" , "Make sure" .)