Aware of sensible use of tomato skin (6)

I believe the answer is:

wiseto

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'aware of sensible' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'use of tomato skin' is the wordplay.
'use of' becomes 'wise' (I can't justify this - if you can you should give a lot more credence to this answer).
'skin' suggests removing the centre (only the skin or outside of the word is used).
'tomato' with its centre removed is 'to'.
'wise'+'to'='WISETO'

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I've seen this clue in The Irish Times.

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