No temporary roller used in hairdo (9,4)
I believe the answer is:
permanent wave
'hairdo' is the definition.
(permanent wave is a kind of hairdo)
'no temporary roller' is the wordplay.
I cannot really understand how this works, but
'no' could be 'n' (common abbreviation) and 'n' is found in the answer.
'roller' could be 'wave' (I've seen this before) and 'wave' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
'used in' acts as a link.
Can you help me to learn more?
(Other definitions for permanent wave that I've seen before include "hair style" , "Treatment for straight hair" , "Hairstyle" .)