Overjoyed when told to go topless (6)
I believe the answer is:
elated
'overjoyed' is the definition.
(I've seen this before)
'told to go topless' is the wordplay.
'told' becomes 'related' (as in relating a story).
'to go topless' means to remove the first letter.
'related' with its first letter taken away is 'ELATED'.
'when' acts as a link.
(Other definitions for elated that I've seen before include "Overjoyed, extremely pleased" , "Filled with joy and pride" , "Exhilarated, highly excited" , "Cock-a-hoop" , "Gleeful" .)