Material about to be ignored in youngster's drawer (5)
I believe the answer is:
rayon
'material' is the definition.
(type of fabric)
'about to be ignored in youngster's drawer' is the wordplay.
'about' becomes 'on' (as in a book 'on' a certain topic).
'to' says to put letters next to each other (I've seen this in other clues).
'be ignored in youngster's drawer' becomes 'ray' (I can't justify this - if you can you should believe this answer much more).
'on' put after 'ray' is 'RAYON'.
Can you help me to learn more?
(Other definitions for rayon that I've seen before include "Cellulose fabric" , "Material - or any (anag)" , "Or any (anag) -- fibre" , "Synthetic fibre" , "Silklike material" .)