Bird's leisure-time pursuit (5)

I believe the answer is:

hobby

I'm a little stuck... Click here to teach me more about this clue!

'pursuit' is the definition.
(I have seen 'Favourite pursuit ' mean 'hobby' so perhaps 'pursuit' could also mean 'hobby')

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 of prey - pastime" , "Favourite pastime" , "pursuit of birdwatcher?" , "Bird - eg bird-watching" , "Favourite pursuit" .)

I've seen this clue in The Sun.

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