Crossword Genius

Matches used when building is in flames? (10)

Ross

I believe the answer is:

semifinals

'matches' is the definition.
(semifinal is a type of match)

'used when building is in flames?' is the wordplay.
'used when building' indicates anagramming the letters (letters built or arranged differently).
'is'+'in'+'flames'='isinflames'
'isinflames' anagrammed gives 'SEMIFINALS'.

I've seen this clue in The Times.
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