Learner's badge (1-5)

I believe the answer is:

l-plate

(Other definitions for l-plate that I've seen before include "Sign of driver under tuition" , "Sign to be fixed to car driven by learner" , "It denotes a learner" , "Sign of a learner driver" , "Learner drivers must display this" .)

I've seen this clue in The Times.

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