Crossword Genius

Top off container, one pulling on handle quicker? (8)

Ross

I believe the answer is:

cleverer

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

'quicker?' is the definition.
Both the definition and answer are comparative adjectives. Maybe you can see a link between them that I can't see?

'top off container one pulling on handle' is the wordplay.
I cannot quite see how this works, but
'on' could be 're' (regarding) and 're' is found in the answer.
'handle' could be 'lever' (I've seen this before) and 'lever' is found within the answer.
A single letter 'c' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for cleverer that I've seen before include "More mentally quick" , "Mentally quicker" , "More intelligent" .)

I've seen this clue in The Guardian.
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