Crossword Genius

Luddites used to wreck these towers (5)

Ross

I believe the answer is:

looms

I believe this clue is a double definition.

'luddites used to wreck these' is the first definition.
(19th-century Luddites destroyed looms)

'towers' is the second definition.
('loom' can be a synonym of 'tower')

(Other definitions for looms that I've seen before include "Rises threateningly ahead with weaving machines" , "More than one machine" , "appears indistinctly" .)

I've seen this clue in The Telegraph.
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