Many set free in this? (7)

I believe the answer is:

amnesty

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'this?' is the definition.
The definition suggests a singular noun which matches the answer.

'many set free' is the wordplay.
'free' indicates an anagram.
'many'+'set'='manyset'
'manyset' is an anagram of 'AMNESTY'.

'in' is the link.

Can you help me to learn more?

(Other definitions for amnesty that I've seen before include "Organisation concerned with people unjustly imprisoned" , "Period of forgiveness for infractions" , "Men stay (anag.)" , "General pardon, usually political" , "Dispensation" .)

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