Crossword Genius

Small vehicle that one might pick? (4)

Ross

I believe the answer is:

scab

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

'small vehicle that one might pick?' is the definition.
The definition and answer can be both body parts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'small vehicle' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'vehicle' becomes 'cab' (cab is a kind of vehicle).
's'+'cab'='SCAB'

Can you help me to learn more?

(Other definitions for scab that I've seen before include "cause of itch?" , "Blackleg - sign of injury" , "Strikebreaker; mange" , "Encrustation for the strikebreaker" , "He's not out" .)

I've seen this clue in The Sun.
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