I'm cold, working with English musical (7)
I believe the answer is:
melodic
'musical' is the definition.
(thesaurus)
'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' 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" .)