Crossword Genius

Ground zero's hit, pinning western guns (9)

Ross

I believe the answer is:

howitzers

'guns' is the definition.
(I know this)

'ground zero's hit pinning western' is the wordplay.
'ground' is an anagram indicator ('grind' the letters into a new form).
'pinning' indicates putting letters inside.
'western' becomes 'w'.
'zeros'+'hit'='zeroshit'
'zeroshit' is an anagram of 'hoitzers'.
'hoitzers' going around 'w' is 'HOWITZERS'.

I've seen this clue in The Telegraph.
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