It settles the issue in a manner possibly decried (7)

I believe the answer is:

decider

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'it settles the issue in a manner' is the definition.
The definition suggests a singular noun which matches the answer.

'possibly decried' is the wordplay.
'possibly' indicates an anagram.
'decried' is an anagram of 'DECIDER'.

Can you help me to learn more?

(Other definitions for decider that I've seen before include "Replay perhaps" , "Game settling a contest" , "Last game after a draw" , "Result-settling game" , "It settles the matter" .)

I've seen this clue in the Evening Standard.

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