I'm irate, however now show must go on! (7)
I believe the answer is:
airtime
'show must go on' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'i'm irate however' is the wordplay.
'however' indicates an anagram.
'im'+'irate'='imirate'
'imirate' is an anagram of 'AIRTIME'.
'now' is the link.
Can you help me to learn more?
(Other definitions for airtime that I've seen before include "Duration of TV/radio programme" , "Broadcasting period" , "Length of a particular broadcast" , "Period of broadcast transmission" , "spell on the waves?" .)