A most unpleasant “Is one to restore order in it?” (7)

I believe the answer is:

noisome

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'a most unpleasant' is the definition.
I can't tell whether this definition defines the answer.

'is one to restore order in it?' is the wordplay.
'to restore' is an anagram indicator (I've seen 'restored' mean this).
'order' becomes 'om' (Order of Merit).
'in it?' indicates putting letters inside.
'is'+'one'='isone'
'isone' is an anagram of 'noise'.
'noise' going around 'om' is 'NOISOME'.

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(Other definitions for noisome that I've seen before include "Harmful - offensive" , "noxious smells" , "Disagreeable - noxious" , "Repugnant" , "Nasty" .)

I've seen this clue in the Evening Standard.

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