Glass front missing - it has strings attached (4)

I believe the answer is:

lute

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'it has strings attached' is the definition.
(type of stringed instrument)

I don't understand how the remainder of the clue works.

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(Other definitions for lute that I've seen before include "Play instrument" , "Subject to drugs" , "Ancient stringed instrument" , "Plucked instrument; a sealant" , "instrument that minstrel played" .)

I've seen this clue in The Daily Express.

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