Crossword Genius

Except when included in gun lessons (6)

Ross

I believe the answer is:

unless

'except when' is the definition.
('except when' can mean 'unless')

'included in gun lessons' is the wordplay.
'included in' indicates a hidden word.
'UNLESS' is hidden in the letters of 'gun lessons'.

(Other definitions for unless that I've seen before include "Except on the condition that" , "bar" , "Otherwise than if" , "Conjunction meaning except when" , "Except, save" .)

I've seen this clue in The Times.
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