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Professional farm vehicle used by geometry students (10)

Ross

I believe the answer is:

protractor

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'professional farm vehicle used by geometry students' is the definition.
I can't tell whether this definition defines the answer.

'professional farm vehicle used by' is the wordplay.
'professional' becomes 'pro' (abbreviation).
'farm vehicle' becomes 'tractor' (vehicle used on a farm).
'used by' is a charade indicator (letters next to each other).
'pro'+'tractor'='PROTRACTOR'

Can you help me to learn more?

(Other definitions for protractor that I've seen before include "Geometrical instrument" , "Geometry set item" , "muscle" , "Angle-measuring device" , "draughtsman may use this" .)

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