I'm cold, working with English musical (7)
I believe the answer is:
melodic
'musical' is the definition.
(I've seen this before)
'i'm cold working with english' is the wordplay.
'working with' indicates anagramming the letters (working with the letters).
'english' becomes 'E' (abbreviation).
'im'+'cold'='imcold'
'imcold' with its letters anagrammed with 'e' gives 'MELODIC'.
(Other definitions for melodic that I've seen before include "nice on the ear" , "Pleasant to listen to" , "Old mice (anag.)" , "Pleasant-sound" , "Of music, tuneful and sweet" .)