Crossword Genius

Big-headed American's vehicle (3)

Ross

I believe the answer is:

bus

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

'vehicle' is the definition.
(bus is a kind of vehicle)

'big-headed american's' is the wordplay.
'big-headed' becomes 'b' (this could be a standard abbreviation I've not previously seen).
'american' becomes 'us' (abbreviation for United States).
'b'+'us'='BUS'

Can you help me to learn more?

(Other definitions for bus that I've seen before include "Road vehicle able to carry many passengers" , "Charabanc" , "Mode of public transport" , "Public transport vehicle" , "Use transport" .)

I've seen this clue in the Evening Standard.
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