Relatives loading recoiling weapon for zapping (6)

'zapping' is the definition.
('nuke' can be a synonym of 'zap')

'relatives loading recoiling weapon' is the wordplay.
'relatives' becomes 'kin' (kin can mean relatives or family).
'loading' means one lot of letters goes inside another (some letters are loaded into others).
'recoiling' says the letters should be written backwards.
'weapon' becomes 'gun' (gun is a kind of weapon).
'gun' in reverse letter order is 'nug'.
'kin' going within 'nug' is 'NUKING'.

'for' is the link.