Crossword Genius

Weapon a touch in fashion (8)

Ross

I believe the answer is:

catapult

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

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

'a touch in fashion' is the wordplay.
I cannot quite understand how this works, but
'a' is within the answer.
'touch' could be 'tap' (tap is a kind of touch) and 'tap' is located in the answer.
'fashion' could be 'cult' (cult is a kind of fashion) and 'cult' is found within the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for catapult that I've seen before include "Throwing device or sling" , "Weapon for hurling stones" , "Stone-hurling weapon" , "Simple elastic device for shooting projectiles" , "Device for firing stones or rocks" .)

I've seen this clue in The Sun.
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