Crossword Genius

Sensible to control a learner (8)

Ross

I believe the answer is:

rational

'sensible' is the definition.
(associated in meaning)

'control a learner' is the wordplay.
'control' becomes 'ration' (to ration something is to control its supply).
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'ration'+'a'+'l'='RATIONAL'

'to' is the link.

(Other definitions for rational that I've seen before include "In accordance with logic" , "Thinking - not a liar (anag)" , "17 [INTELLIGENT]" , "Based on reason or logic" , "Consistent with logic" .)

I've seen this clue in The Telegraph.
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