Dope making a comeback: a singer who’s over the top (4,2)
I believe the answer is:
past it
'over the top' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'dope making a comeback a singer' is the wordplay.
'dope' becomes 'sap' (I've seen this in another clue).
'making a comeback' says the letters should be written backwards.
'a singer' becomes 'tit' (type of songbird).
'sap' backwards is 'pas'.
'pas'+'tit'='PAST IT'
'who's' acts as a link.
Can you help me to learn more?
(Other definitions for past it that I've seen before include "Spit at, being too old or decrepit" , "Too old to be of use" , "Too old for anything" , "Unable to function any more, perhaps due to age" , "no longer fresh" .)