Crossword Genius

Garage where favourite composer, leaving hydrogen, fills quota (6,7)

Ross

I believe the answer is:

petrol station

I'm a little stuck... Click here to teach me more about this clue!

'garage' is the definition.

'favourite composer leaving hydrogen fills quota' is the wordplay.
I cannot really see how this works, but
'favourite' could be 'pet' (synonyms) and 'pet' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

'where' acts as a link.

Can you help me to learn more?

(Other definitions for petrol station that I've seen before include "Place to fill the tank" , "Filling up location?" , "Fuel supplier" .)

I've seen this clue in The Times.
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