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Ian's upset after lunch starter got cancelled. Lets loose! (8)

Ross

I believe the answer is:

unchains

I'm a little stuck... Click here to teach me more about this clue!

'lets loose' is the definition.
(I've seen this before)

'ian's upset after lunch starter got cancelled' is the wordplay.
I cannot really see how this works, but
an anagram of 'ian' is 'ain' which is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for unchains that I've seen is " Lets loose".)

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