Hesitant to accept strange material (6)
I believe the answer is:
shoddy
'material' is the definition.
(shoddy is a kind of material)
'hesitant to accept strange' is the wordplay.
'hesitant' becomes 'shy' (I can't explain this - if you can you should give a lot more credence to this answer).
'to accept' means one lot of letters goes inside another.
'strange' becomes 'odd' (I've seen this in another clue).
'shy' going around 'odd' is 'SHODDY'.
Can you help me to learn more?
(Other definitions for shoddy that I've seen before include "recycled material" , "Cheap and nasty" , "Cheap and inferior" , "Gimcrack" , "cheap material" .)