That female ahead is fond of fish (5)
I believe the answer is:
heron
'fond of fish' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'that female ahead' is the wordplay.
'that female' becomes 'her' ('her' refers to a woman).
'ahead' becomes 'on' (synonyms).
'her'+'on'='HERON'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for heron that I've seen before include "flier" , "Large British wading bird" , "Long-legged long-necked wading bird" , "One bird" , "Large fish-eating bird" .)