Crossword Genius

A bushel and a pound for a tuber (4)

Ross

I believe the answer is:

bulb

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'tuber' is the definition.
(thesaurus)

'a bushel and a pound' is the wordplay.
'a bushel' becomes 'bu' (I can't justify this - if you can you should give a lot more credence to this answer).
'and' is a charade indicator (letters next to each other).
'a pound' becomes 'lb' (abbreviation for the unit of weight).
'bu'+'lb'='BULB'

'for a' is the link.

Can you help me to learn more?

(Other definitions for bulb that I've seen before include "From which a tulip or light comes" , "shiner" , "This provides light" , "Eg, hyacinth" , "Flower seed or lighting device" .)

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