Right-hander who smashed mugs in Liberty's once (5)

I believe the answer is:

tyson

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'right-hander who smashed mugs' is the definition.
The definition suggests a singular noun which matches the answer.

'in liberty's once' is the wordplay.
'in' indicates a hidden word.
'TYSON' is hidden within 'libertys once'.

Can you help me to learn more?

(Other definitions for tyson that I've seen before include "Mike ..., former US prizefighter" , "Youngest ever undisputed world heavyweight boxing champion, b, 1966" , "American world heavyweight champion, b. 1966" , "26 4 [RING MASTER]" , "US world heavyweight boxing champion, b.1966 -- English fast bowler, d. 2015" .)

I've seen this clue in The Independent.

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