Diana represented female spirit (5)
I believe the answer is:
naiad
'female spirit' is the definition.
'diana represented' is the wordplay.
'represented' is an anagram indicator.
'diana' with letters rearranged gives 'NAIAD'.
(Other definitions for naiad that I've seen before include "River nymph" , "Nymph of lakes, springs and rivers" , "Fabulous spring being" , "Aquatic larva of a dragonfly" , "Diana (anag.)" .)