Singer-songwriter given to twitching? (5)

I believe the answer is:

birdy

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'to twitching?' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'singer-songwriter' is the wordplay.
'singer' becomes 'bird' (synonyms).
'songwriter' becomes 'y' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'bird'+'y'='BIRDY'

'given' is the link.

Can you help me to learn more?

I've seen this clue in The Independent.

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