Robin playing over intro of boy band (6)
I believe the answer is:
ribbon
'band' is the definition.
(I've seen this before)
'robin playing over intro of boy' is the wordplay.
'playing' indicates anagramming the letters.
'over' is an insertion indicator.
'intro of' says to take the initial letters.
The initial letter of 'boy' is 'b'.
'robin' is an anagram of 'ribon'.
'ribon' going around 'b' is 'RIBBON'.
(Other definitions for ribbon that I've seen before include "Narrow strip of coloured cloth, worn as ornament" , "Narrow strip of fabric" , "Thin strip of cloth" , "Decorative strip of material" , "Long strip of material" .)