Teased roughly for not being well synchronised (6)
I believe the answer is:
ragged
'teased' is the definition.
('rag' can be a synonym of 'tease')
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for ragged that I've seen before include "Teased; untidy; badly dressed" , "ridiculed" , "Of clothes, frayed and torn" , "Scruffy" , "Unkempt" .)