In more ways than one, it may be flying (5)
I believe the answer is:
hobby
'flying' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for hobby that I've seen before include "Bird - eg bird-watching" , "Bird of prey - pastime" , "interest" , "Favourite pursuit" , "Favourite pastime" .)