Be very enthusiastic about the number by the composer (5)

I believe the answer is:

ravel

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'the composer' is the definition.
(Maurice Ravel)

'be very enthusiastic about the number' is the wordplay.
'be very enthusiastic about' becomes 'rave' (I can't explain this - if you can you should give a lot more credence to this answer).
'the number' becomes 'L' (L is an example).
'rave'+'l'='RAVEL'

'by' is the link.

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(Other definitions for ravel that I've seen before include "French composer, Maurice (1875-1937)" , "note-writer observed" , "Fray; composer" , "Bolero's composer" , "He scored" .)

I've seen this clue in the Evening Standard.

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