Montenegro upstaged some of the band (5)
I believe the answer is:
group
'band' is the definition.
(I know that band can be written as group)
'montenegro upstaged some of' is the wordplay.
'some of' indicates the answer is hidden within the clue.
'GROUP' is hidden in the letters of 'montenegro upstaged'.
'the' is the link.
(Other definitions for group that I've seen before include "Take That, perhaps" , "Clique" , "Set; place together" , "Set; band" , "Crew" .)