Crossword Genius

One with tanks is dipping into a quantity of liquid (8)

Ross

I believe the answer is:

aquarist

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

'a quantity of liquid' is the definition.
I can't tell whether this defines the answer.

'one with tanks is dipping into' is the wordplay.
'one' becomes 'a' (a thing is one thing).
'with' is a charade indicator (letters next to each other).
'tanks' becomes 'quart' (I can't explain this - if you can you should believe this answer much more).
'dipping into' is an insertion indicator.
'quart' placed around 'is' is 'quarist'.
'a'+'quarist'='AQUARIST'

Can you help me to learn more?

(Another definition for aquarist that I've seen is " one keeping fish".)

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