Crossword Genius

Discipline children with a gun! (7)

Ross

I believe the answer is:

chasten

'discipline' is the definition.
(I've seen this before)

'children with a gun' is the wordplay.
'children' becomes 'ch' (genealogical abbreviation).
'with' says to put letters next to each other.
'gun' becomes 'sten' (British sub-machine gun).
'ch'+'a'+'sten'='CHASTEN'

(Other definitions for chasten that I've seen before include "Punish, purify" , "Suppress" , "Moderate" , "Have a restraining effect on (someone)" , "Castigate or punish" .)

I've seen this clue in The Independent.
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