A sign erected over Tyneside plant (7)

I believe the answer is:

anemone

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'plant' is the definition.
(anemone is a kind of plant)

'a sign erected over tyneside' is the wordplay.
'a sign' becomes 'mena' (I am not sure about this - if you are sure you should believe this answer much more).
'erected' shows that the letters should be reversed in order (in a down clue, letters go up).
'over' becomes 'o' (cricket abbreviation).
'tyneside' becomes 'NE' (area in North East of England).
'mena' backwards is 'anem'.
'anem'+'o'+'ne'='ANEMONE'

Can you help me to learn more?

(Other definitions for anemone that I've seen before include "Plant; sea creature" , "Plant with bright flowers" , "Flowering plant - mean one (anag)" , "Windflower - sea creature" , "Bright flower or sea plant" .)

I've seen this clue in The Times.

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