One is restoring order in it, but it’s most unpleasant (7)

I believe the answer is:

noisome

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'unpleasant' is the definition.
(I've seen this before)

'one is restoring order in it' is the wordplay.
'restoring' indicates an anagram (I've seen 'restored' mean this).
'order' becomes 'om' (Order of Merit).
'in it' is an insertion indicator.
'one'+'is'='oneis'
'oneis' with letters rearranged gives 'noise'.
'noise' placed around 'om' is 'NOISOME'.

'but it's most' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for noisome that I've seen before include "Humming" , "Moonies (anag.)" , "Odorous" , "Extremely unpleasant" , "Harmful to health; disgusting" .)

I've seen this clue in the Evening Standard.

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