It isn’t hard water, you see (6)

I believe the answer is:

notice

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'you see' is the definition.
'notice' can be an answer for 'see' (thesaurus). I'm not certain of the 'you' bit.

'it isn't hard water' is the wordplay.
'it isn't' becomes 'not' (I can't explain this - if you can you should give a lot more credence to this answer).
'hard water' becomes 'ice'.
'not'+'ice'='NOTICE'

Can you help me to learn more?

(Other definitions for notice that I've seen before include "Observe or regard" , "Spot - review" , "Announcement or warning" , "Detect" , "Observe - written announcement" .)

I've seen this clue in the Evening Standard.

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