Crossword Genius

Measurer for vehicle (10)

Ross

I believe the answer is:

protractor

'measurer' is the definition.
(a protractor is used to measure angles)

'for vehicle' is the wordplay.
'for' becomes 'pro' (as in being 'pro' something).
'vehicle' becomes 'tractor' (tractor is a kind of vehicle).
'pro'+'tractor'='PROTRACTOR'

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

I've seen this clue in The Times.
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