Childish weapons produced in Bath presumably used to liquidate those making a splash around pool? (5,7)

I believe the answer is:

water pistols

I'm a little stuck... Click here to teach me more about this clue!

'in bath presumably used to liquidate those making a splash around pool?' is the definition.
I can't tell whether this defines the answer.

'childish weapons' is the wordplay.
'childish' becomes 'water' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'weapons' becomes 'pistols' (pistol is a kind of weapon).
'water'+'pistols'='WATER PISTOLS'

'produced' acts as a link.

Can you help me to learn more?

I've seen this clue in the Irish Times.

Want a hint initially instead of a full solution? Install my app