Crossword Genius

Ancient byre repairs happening very infrequently (11)

Ross

I believe the answer is:

bicentenary

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'happening very infrequently' is the definition.
I can't judge whether this definition defines the answer.

'ancient byre repairs' is the wordplay.
'repairs' is an anagram indicator (I've seen 'repaired' mean this).
'ancient'+'byre'='ancientbyre'
'ancientbyre' with letters rearranged gives 'BICENTENARY'.

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I've seen this clue in The Guardian.
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