Crossword Genius

Period of instruction (6)

Ross

I believe the answer is:

lesson

'period of instruction' is the definition.
(a lesson is instructional)

This is the entire clue.

(Other definitions for lesson that I've seen before include "Unit of instruction" , "Period of learning" , "Spell of teaching" , "Reading or exercise to be studied" , "See 1" .)

I've seen this clue in The Mirror, the Sydney Morning Herald, the Evening Standard and The Guardian.
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