Snack — you've nibbled one when entertaining Hamish? (8)

I believe the answer is:

biscotti

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

'nibbled one when entertaining hamish?' is the wordplay.
'nibbled' becomes 'bit' (I've seen this in other clues).
'one' becomes 'i' (Roman numeral).
'when entertaining' indicates putting letters inside.
'hamish?' becomes 'Scot' (Hamish is a common Scottish name).
'bit'+'i'='biti'
'biti' enclosing 'scot' is 'BISCOTTI'.

'you've' acts as a link.

Can you help me to learn more?

(Another definition for biscotti that I've seen is " Italian biscuit flavoured with almonds".)

I've seen this clue in The Guardian.

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