A cycle put together roughly (6)
I believe the answer is:
around
'roughly' is the definition.
(around can mean roughly or approximately)
'a cycle put together' is the wordplay.
'cycle' becomes 'round' (going round once).
'put together' means one lot of letters go next to another.
'a'+'round'='AROUND'
(Other definitions for around that I've seen before include "Here and there, sounds circular" , "Somewhere near" , "On every side" , "More or less" , "Close to" .)