Admirer observed saying something that's cutting (6)

I believe the answer is:

bowsaw

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'something that's cutting' is the definition.
I can't judge whether this definition defines the answer.

'admirer observed' is the wordplay.
'admirer' becomes 'bow' (I can't justify this - if you can you should give a lot more credence to this answer).
'observed' becomes 'saw' (seen).
'bow'+'saw'='BOWSAW'

'saying' is the link.

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I've seen this clue in The Irish Times.

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