Stretchy material that may come from Castile (7)
I believe the answer is:
elastic
'stretchy material that' is the definition.
'elastic' can be an answer for 'stretchy' (something elastic can be stretched). I am unsure of the rest of the definition.
'may come from castile' is the wordplay.
'may come from' indicates anagramming the letters (the answer may come from the same letters).
'castile' anagrammed gives 'ELASTIC'.
Can you help me to learn more?
(Other definitions for elastic that I've seen before include "It's lace (anag.)" , "Flexible, adaptable" , "Laciest (anag.)" , "Material that stretches" , "Stuff that stretches to Castile" .)