Chap demanding a final song, perhaps (8)

I believe the answer is:

alastair

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'chap' is the definition.

'a final song perhaps' is the wordplay.
'final' becomes 'last' (synonyms).
'song perhaps' becomes 'air' (I can't explain this - if you can you should give a lot more credence to this answer).
'a'+'last'+'air'='ALASTAIR'

'demanding' acts as a link.

Can you help me to learn more?

(Other definitions for alastair that I've seen before include "A Scots name" , "Scotsman?" .)

I've seen this clue in The Times.

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