How bird perhaps remains uncommitted (4,2,3,5)

I believe the answer is:

sits on the fence

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'how bird' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'remains uncommitted' is the wordplay.
'remains' becomes 'sits' (I can't justify this - if you can you should believe this answer much more).
'uncommitted' becomes 'on the fence' (I've seen this in another clue).
'sits'+'onthefence'='SITS ON THE FENCE'

'perhaps' is the link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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