Two females in AA with Irish pigeon (6)
I believe the answer is:
affair
'pigeon' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'two females in aa with irish' is the wordplay.
'two females' becomes 'ff' (an abbreviation for female written twice).
'in' indicates putting letters inside.
'with' is a charade indicator (letters next to each other).
'irish' becomes 'IR' (abbreviation for Irish).
'ff' placed within 'aa' is 'affa'.
'affa'+'ir'='AFFAIR'
Can you help me to learn more?
(Other definitions for affair that I've seen before include "River dam" , "Involvement" , "Event; fling" , "Vaguely specified concern" , "A fling (or something more serious?)" .)