Eager to capture one in nude perhaps (8)
I believe the answer is:
painting
'nude perhaps' is the definition.
(nude is a kind of painting)
'eager to capture one' is the wordplay.
'eager' becomes 'panting' (panting for something can mean being eager for it).
'to capture' indicates putting letters inside.
'one' becomes 'i' (roman numeral).
'panting' enclosing 'i' is 'PAINTING'.
'in' acts as a link.
(Other definitions for painting that I've seen before include "Work of a kind" , "Artwork" , "image?" , "Graphic art" , "Artistic composition" .)