Keen to be seen in space-age romp (5)
I believe the answer is:
eager
'keen' is the definition.
(I've seen this in another clue)
'seen in space-age romp' is the wordplay.
'seen in' says the answer is hidden in the clue.
'EAGER' is hidden within 'space age romp'.
'to be' acts as a link.
(Other definitions for eager that I've seen before include "Longing to see" , "hungry" , "Desperate" , "passionate" , "Alert and active type?" .)