Can go off routine (5)
I believe the answer is:
conga
'routine' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'can go off' is the wordplay.
'off' indicates an anagram.
'can'+'go'='cango'
'cango' is an anagram of 'CONGA'.
Can you help me to learn more?
(Other definitions for conga that I've seen before include "Circuitous line dance" , "Dance performed in line" , "Latin American dance performed in single file" , "Party dance" , "Latin American "follow-my-leader" dance" .)