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Then looks oddly at features of plank (9)

Ross

I believe the answer is:

knotholes

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'features of plank' is the definition.
Although both the answer and definition are plural nouns, I don't see how one could define the other.

'then looks oddly' is the wordplay.
'oddly' is an anagram indicator (letters in an odd order).
'then'+'looks'='thenlooks'
'thenlooks' with letters rearranged gives 'KNOTHOLES'.

'at' is the link.

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I've seen this clue in The Mirror.
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