Flighty, pigheaded admirer (6)
I believe the answer is:
plover
'flighty pigheaded admirer' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'pigheaded admirer' is the wordplay.
'pigheaded' becomes 'p' (this could be a standard abbreviation which I don't know about).
'admirer' becomes 'lover' (I've seen this before).
'p'+'lover'='PLOVER'
Can you help me to learn more?
(Other definitions for plover that I've seen before include "No Stranger on the Shore" , "Wading bird, such as a peewit" , "Lapwing, for example" , "Shore bird with long pointed wings" , "Lapwing-like bird" .)