Crossword Genius

Lid used as iron horse's cover (9)

Ross

I believe the answer is:

caparison

'horse's cover' is the definition.
(I've seen this before)

'lid used as iron' is the wordplay.
'lid' becomes 'cap' (I've seen this before).
'used' indicates anagramming the letters.
'as'+'iron'='asiron'
'asiron' is an anagram of 'arison'.
'cap'+'arison'='CAPARISON'

(Other definitions for caparison that I've seen before include "Cover for a horse" , "horse's cover" , "covering for the Shires?" , "sumptuous clothing" , "Decorative covering for a horse" .)

I've seen this clue in the Sydney Morning Herald.
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