Sort of pine for Hugh, say, still available (4)

I believe the answer is:

huon

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'sort of pine for hugh' is the definition.
I know nothing about this answer so I can't tell whether this works.

'still available' is the wordplay.
'still' becomes 'hu' (I can't explain this - if you can you should believe this answer much more).
'available' becomes 'on' (I've seen this in other clues).
'hu'+'on'='HUON'

'say' acts as a link.

Can you help me to learn more?

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

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