Crossword Genius

Informs students in set up (5)

Ross

I believe the answer is:

tells

'informs' is the definition.
(telling is a kind of informing)

'students in set up' is the wordplay.
'students' becomes 'LL' (two abbreviations for learner).
'in' means one lot of letters goes inside another.
'up' is a reversal indicator (in down clue: letters go upwards).
'll' inserted within 'set' is 'sllet'.
'sllet' reversed gives 'TELLS'.

(Other definitions for tells that I've seen before include "Informs, recounts" , "Counts" , "Narrates" .)

I've seen this clue in The Mirror.
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