Like little birdie said, why affair kept hidden? (6)
I believe the answer is:
flying
'like little birdie' is the definition.
'flying' can be an answer for 'birdie'. I'm unsure of the 'like little' bit.
'said why affair kept hidden?' is the wordplay.
I cannot really see how this works, but
'why' could be 'y' and 'y' is found within the answer.
'affair' could be 'fling' (a fling is a romantic affair) and 'fling' is found within the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for flying that I've seen before include "Air travel" , "''Those magnificent men in their ... machines'' (film theme song)" , "UFO" , "running fast" , "(Of time) passing swiftly" .)