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Sweets that go bad when put in water (7)

Ross

I believe the answer is:

toffees

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

'sweets that go' is the definition.
'toffees' can be an answer for 'sweets' (toffee is a kind of sweet). I am not certain of the rest of the definition.

'bad when put in water' is the wordplay.
'bad' becomes 'off' (eg meat that's gone off is bad).
'when' becomes 'e' (I've seen this in other clues).
'put in' is an insertion indicator.
'water' becomes 'tes' (I can't explain this - if you can you should give a lot more credence to this answer).
'off'+'e'='offe'
'offe' placed into 'tes' is 'TOFFEES'.

Can you help me to learn more?

(Other definitions for toffees that I've seen before include "Caramels" , "Sweets" .)

I've seen this clue in the Evening Standard.
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