Horizontal underground stems (8)
I believe the answer is:
rhizomes
'horizontal underground stems' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for rhizomes that I've seen before include "Underground stems that produce roots and shoots" , "Horizontal underground stems, they put out lateral shoots" .)
I've seen this clue in the Irish Times (Simplex) and The Irish Times.
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