Extremely busy? Oh no, get relaxed (2,3,2)
I believe the answer is:
on the go
'extremely busy?' is the definition.
'on the go' can be an answer for 'busy?' ('on the go' can be similar in meaning to 'busy'). I am unsure of the 'extremely' bit.
'oh no get relaxed' is the wordplay.
'relaxed' indicates anagramming the letters.
'oh'+'no'+'get'='ohnoget'
'ohnoget' anagrammed gives 'ON THE GO'.
Can you help me to learn more?
(Other definitions for on the go that I've seen before include "Active, in constant motion" , "Always busy" , "ready to start monopoly?" , "Active, always doing something" , "Very busy, in constant motion" .)