This person's wearing red, exotically fur-trimmed (7)

I believe the answer is:

ermined

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'this person's wearing red exotically' is the definition.
The definition suggests a singular noun but the answer is not.

'fur-trimmed' is the wordplay.
'fur' becomes 'ermine' (ermine is a kind of fur).
'trimmed' becomes 'd' (I am not sure about this - if you are sure you should believe this answer much more).
'ermine'+'d'='ERMINED'

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(Other definitions for ermined that I've seen before include "Dressed in fur" , "like the Lords" , "Like peers' robes" , "wearing fur" , "with fur trimming" .)

I've seen this clue in The Times.

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