Quality material provided by Tyrus at intervals (5)
I believe the answer is:
satin
'quality material' is the definition.
'satin' can be an answer for 'material' (satin is a kind of material). I am not sure about the 'quality' bit.
'provided by tyrus at intervals' is the wordplay.
'provided by' indicates the answer is hidden within the clue (the answer is provided within the clue).
'SATIN' is hidden within 'tyrus at intervals'.
Can you help me to learn more?
(Other definitions for satin that I've seen before include "Saint (anag.)" , "Silky material" , "Fine material" , "Glossy textile" , "covered with?" .)