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Show anxiety when upset about a species of milfoil (6)

Ross

I believe the answer is:

yarrow

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'a species of milfoil' is the definition.
(I've seen this before)

'show anxiety when upset about' is the wordplay.
'show' becomes 'a' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'anxiety' becomes 'worry' (worry is a kind of anxiety).
'when upset' says the letters should be written in reverse (in a down clue - set, written, up).
'about' means one lot of letters goes inside another.
'worry' back-to-front is 'yrrow'.
'a' going inside 'yrrow' is 'YARROW'.

Can you help me to learn more?

(Other definitions for yarrow that I've seen before include "This herb is strangely a worry" , "Herb; a worry (anag.)" , "Perennial herb, milfoil" , "Creeping plant, also called milfoil" , "Species of milfoil" .)

I've seen this clue in The Irish Independent.
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