Massacre of Manchester City in safe game (8)

I believe the answer is:

peterloo

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'massacre of manchester city' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'safe game' is the wordplay.
'safe' becomes 'peter' (slang term for a safe).
'game' becomes 'loo' (historical card game).
'peter'+'loo'='PETERLOO'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for peterloo that I've seen before include "massacre, say" , "So-called massacre" , "Name given to Manchester massacre" , "1819 Manchester massacre scene" , "Site of 1819 Manchester massacre" .)

I've seen this clue in The Times.

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