Very happy to stake a birdhouse for the Reverend (4-1-4)

I believe the answer is:

cock-a-hoop

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

'very happy' is the definition.
'cock-a-hoop' can be an answer for 'happy' (I've seen this before). I'm unsure of the 'very' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for cock-a-hoop that I've seen before include "In raptures" , "Pleased and triumphant, like rooster with hula toy" , "In high spirits" , "Overjoyed" , "Jubilant" .)

I've seen this clue in The Guardian.

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