To push off, one’s gone through the roof (4,2)
I believe the answer is:
shot up
'one's gone through the roof' is the definition.
I can't tell whether this defines the answer.
'to push off' is the wordplay.
'off' indicates an anagram.
'to'+'push'='topush'
'topush' anagrammed gives 'SHOT UP'.
Can you help me to learn more?
(Other definitions for shot up that I've seen before include "Grew quickly" , "very quickly got high" .)