Playing iTunes on large device (7)
I believe the answer is:
utensil
'device' is the definition.
(thesaurus)
'playing itunes on large' is the wordplay.
'playing' is an anagram indicator.
'on' is a charade indicator (letters next to each other).
'large' becomes 'L' (eg in clothes sizes).
'itunes' is an anagram of 'utensi'.
'utensi'+'l'='UTENSIL'
(Other definitions for utensil that I've seen before include "A container for kitchen use" , "Can opener, for example" , "Implement for practical use" , "Item, eg for kitchen" , "E.g. colander" .)