Crossword Genius

Round back of house, see mostly older type of plant (7)

Ross

I believe the answer is:

senecio

'type of plant' is the definition.
(senecio is a type of flowering plant)

I can't explain the rest of the clue.

(Other definitions for senecio that I've seen before include "Groundsel" , "Ragwort" .)

I've seen this clue in The Guardian.
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