Crossword Genius

It's instrumental in coral gas production (3,7)

Ross

I believe the answer is:

cor anglais

'it's instrumental' is the definition.
(cor anglais is a kind of musical instrument)

'in coral gas production' is the wordplay.
'production' is an anagram indicator.
'in'+'coral'+'gas'='incoralgas'
'incoralgas' anagrammed gives 'COR ANGLAIS'.

(Other definitions for cor anglais that I've seen before include "Woodwind instrument" , "MUSICAL INSTRUMENT" , "belonging to a broken-down 27 [CARTHORSE]" , "Orchestra member rarely" , "alto member of family" .)

I've seen this clue in The Guardian.
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