Pop singer taking top off to reveal tattoo (3)
I believe the answer is:
ink
'tattoo' is the definition.
(ink can informally mean a tattoo)
'pop singer taking top off' is the wordplay.
I cannot quite see how this works, but
'pop' could be 'in' (both can mean popular) and 'in' is found within the answer.
A single letter 'k' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
'to reveal' is the link.
Can you help me to learn more?
(Other definitions for ink that I've seen before include "Liquid used to write" , "Material used in printing" , "It is ejected by cuttlefish" , "Liquid from a squid" , "Squid's means of concealment" .)