It has a long neck, a rounded body, and frets (5)

I believe the answer is:

sitar

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'it has a long neck' is the definition.
(I've seen this in another clue)

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

Can you help me to learn more?

(Other definitions for sitar that I've seen before include "Plucked instrument" , "Indian string instrument" , "Lasting from morning to night" , "Guitar-like instrument" , "instrument out east" .)

I've seen this clue in the Evening Standard.

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