A piece of embroidery makes an unusual topic (5)

I believe the answer is:

picot

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'a piece of embroidery' is the definition.
I know that 'embroidery' relates to this answer.

'an unusual topic' is the wordplay.
'an unusual' indicates an anagram.
'topic' anagrammed gives 'PICOT'.

'makes' is the link.

Can you help me to learn more?

(Other definitions for picot that I've seen before include "Embroidery stitch - topic (anag)" , "Topic about ornamental thread loop" , "Lace pattern of hoops" , "sequence of loops" , "loopy decoration" .)

I've seen this clue in The Irish Independent.

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