Italian team keeping on leader of chant (7)
I believe the answer is:
intoner
'leader of chant' is the definition.
(somebody who intones or chants)
'italian team keeping on' is the wordplay.
'italian team' becomes 'inter' (I've seen this before).
'keeping' means one lot of letters goes inside another.
'inter' going around 'on' is 'INTONER'.
(Other definitions for intoner that I've seen before include "chanter" , "eg, a monk?" , "Someone who speaks monotonously - iron net (anag)" , "Participant in service" .)