Crossword Genius

One wheeled by a boy? (6)

Ross

I believe the answer is:

barrow

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

'one' is the definition.
The definition and answer can be both quantities as well as being singular nouns.
Maybe there's an association between them I don't understand?

'wheeled by a boy?' is the wordplay.
'wheeled' says the letters should be written backwards (letters are wheeled back).
'by a' becomes 'wor' (I can't justify this - if you can you should believe this answer much more).
'boy?' becomes 'Rab'.
'wor'+'rab'='worrab'
'worrab' reversed gives 'BARROW'.

Can you help me to learn more?

(Other definitions for barrow that I've seen before include "Load-carrying cart - burial mound" , "old burial ground" , "Cart for the river?" , "Handcart; burial mound" , "One-wheeled handcart" .)

I've seen this clue in the Evening Standard.
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