Crossword Genius

Who spends a little more for a work truck? (6)

Ross

I believe the answer is:

tipper

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

'truck?' is the definition.
(I've seen this before)

'who spends a little more for a work' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'per' (eg 'one a day' means 'one per day') and 'per' is found in the answer.
The remaining letters 'tip' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for tipper that I've seen before include "One giving a gratuity" , "One giving gratuities - truck" , "Giver of gratuity" , "Dumping truck - one paying gratuity" , "One who thankfully pays extra" .)

I've seen this clue in the Sydney Morning Herald.
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