Crossword Genius

Vetting, at sea, a French pontoon (5-2-2)

Ross

I believe the answer is:

vingt-et-un

'pontoon' is the definition.
(I've seen this before)

'vetting at sea a french' is the wordplay.
'at sea' is an anagram indicator.
'a french' becomes 'un' ('a' in French).
'vetting' anagrammed gives 'vingtet'.
'vingtet'+'un'='VINGT-ET-UN'

(Other definitions for vingt-et-un that I've seen before include "Pontoon (French)" , "Pontoon, or blackjack" .)

I've seen this clue in The Telegraph.
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