Giant bronze encapsulating sex appeal (5)
I believe the answer is:
titan
'giant' is the definition.
(I know that giant can be written as titan)
'bronze encapsulating sex appeal' is the wordplay.
'bronze' becomes 'tan' (both can mean to get a sun tan).
'encapsulating' means one lot of letters goes inside another (I've seen this in other clues).
'sex appeal' becomes 'it'.
'tan' placed around 'it' is 'TITAN'.
(Other definitions for titan that I've seen before include "One of the first pantheon of Greek deities" , "A son of Uranus and Gaea" , "Saturn's largest satellite" , "Taint in a legendary giant" , "colossal one" .)