Obey it or turn red! (5)
I believe the answer is:
order
'obey it' is the definition.
I can't tell whether this definition defines the answer.
'or turn red' is the wordplay.
'turn' shows that the letters should be reversed in order.
'red' backwards is 'der'.
'or'+'der'='ORDER'
Can you help me to learn more?
(Other definitions for order that I've seen before include "One of Great Lakes" , "plan to reorganise Europe with 1a [NEW]" , "An authoritative command" , "Symmetry" , "Issue a command" .)