Scotsman's small ornament from ice-skating arena kept by corporation (7)

'scotsman's small ornament' is the definition.
I can't tell whether this defines the answer.

'ice-skating arena kept by corporation' is the wordplay.
'ice-skating arena' becomes 'rink' (I've seen this before).
'kept by' indicates putting letters inside.
'corporation' becomes 'tum' ('corporation' is a humorous term for stomach fat).
'rink' put inside 'tum' is 'TRINKUM'.

'from' acts as a link.

Can you help me to learn more?