A wide range of schoolchildren start to play guitar with this and don't use long lead (8)

I believe the answer is:

spectrum

I'm a little stuck... Click here to teach me more about this clue!

'a wide range' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for spectrum that I've seen before include "Light split by prism" , "Bands of colour in crumpets" , "Complete colour range" , "'Broad range, scope (8)'" , "Band of colours in the rainbow" .)

I've seen this clue in The Irish Times.

Want a hint initially instead of a full solution? Install my app