Crossword Genius

Horse holds line with odd instrument (5,4)

Ross

I believe the answer is:

steel drum

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'instrument' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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(Other definitions for steel drum that I've seen before include "Metal instrument" , "Trinidadian instrument" .)

I've seen this clue in The Telegraph.
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