Crossword Genius

Criminal bail a nun furnishes once in six months? (8)

Ross

I believe the answer is:

biannual

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'furnishes once in six months?' is the definition.
I can't tell whether this definition defines the answer.

'criminal bail a nun' is the wordplay.
'criminal' indicates an anagram.
'bail'+'a'+'nun'='bailanun'
'bailanun' anagrammed gives 'BIANNUAL'.

Can you help me to learn more?

(Other definitions for biannual that I've seen before include "Occurring twice yearly" , "Half-yearly" , "Occurring twice a year" , "periodical" , "Happening twice a year" .)

I've seen this clue in The Telegraph.
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