Helped a cook set up to include five (7)
I believe the answer is:
availed
'helped' is the definition.
(availing is a kind of helping)
'a cook set up to include five' is the wordplay.
'cook' becomes 'delia' (Delia Smith**).
'set up' says the letters should be written in reverse.
'to include' is an insertion indicator.
'five' becomes 'v' ('V' can be a synonym of 'five').
'delia' reversed gives 'ailed'.
'a'+'ailed'='aailed'
'aailed' enclosing 'v' is 'AVAILED'.
(Other definitions for availed that I've seen before include "Used, put into service" , "Helped" , "Profited from" , "Used to one's advantage" .)