OAP perhaps is bold going topless, I note (5)
I believe the answer is:
oldie
'oap perhaps' is the definition.
(OAP is an old-age pensioner)
'bold going topless i note' is the wordplay.
'going topless' means to remove the first letter.
'note' becomes 'e' (musical note).
'bold' with its first letter taken off is 'old'.
'old'+'i'+'e'='OLDIE'
'is' acts as a link.
(Other definitions for oldie that I've seen before include "Aged person (colloq.)" , "One getting on" , "Venerable person/thing" , "Popular song from the past" , "no chicken" .)