It moves in circles, or possibly to the right (5)
I believe the answer is:
rotor
'it moves in circles' is the definition.
The definition suggests a singular noun which matches the answer.
'or possibly to the right' is the wordplay.
'possibly' indicates anagramming the letters.
'the right' becomes 'r' (common abbreviation).
'or' with letters rearranged gives 'ro'.
'ro'+'to'+'r'='ROTOR'
Can you help me to learn more?
(Other definitions for rotor that I've seen before include "Helicopter supporter" , "Turning part of an engine" , "Eddy" , "System of turning helicopter blades" , "Turning blade" .)