Crossword Genius

Girl meets boy getting petrol (6)

Ross

I believe the answer is:

gallon

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

'petrol' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'girl meets boy' is the wordplay.
'girl' becomes 'gal' (synonyms).
'meets' says to put letters next to each other.
'boy' becomes 'lon' ().
'gal'+'lon'='GALLON'

'getting' acts as a link.

Can you help me to learn more?

(Other definitions for gallon that I've seen before include "Liquid measure" , "Unit equal to 4 quarts" , "Eight pints or four quarts" , "8 pints (or ten in a hat!)" , "Unit of capacity" .)

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