Material that could be adapted to poet’s lyre (9)
I believe the answer is:
polyester
'material that' is the definition.
'polyester' can be an answer for 'material' (polyester is a kind of material). I'm not sure about the rest of the definition.
'be adapted to poet's lyre' is the wordplay.
'be adapted' is an anagram indicator.
'poets'+'lyre'='poetslyre'
'poetslyre' anagrammed gives 'POLYESTER'.
'could' acts as a link.
Can you help me to learn more?
(Other definitions for polyester that I've seen before include "Textile material" , "Man-made fibre" , "Stole prey (anag) - synthetic material" , "Synthetic textile" , "Synthetic compound" .)