Crossword Genius

Instrument used excessively by a learner? (4)

Ross

I believe the answer is:

tool

'instrument' is the definition.
(I know that instrument can be written as tool)

'excessively by a learner?' is the wordplay.
'excessively' becomes 'too' (to too great a degree).
'by' means one lot of letters go next to another.
'a learner?' becomes 'l' (as in a learner driver with L-plates on their car).
'too'+'l'='TOOL'

'used' acts as a link.

(Other definitions for tool that I've seen before include "Appliance" , "Person used by another" , "Device used for work" , "Drive motor skilfully" , "Cat's-paw; impress design on" .)

I've seen this clue in the Evening Standard.
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