I'm irate, however now show must go on! (7)

I believe the answer is:

airtime

I'm a little stuck... Click here to teach me more about this clue!

'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?" .)

I've seen this clue in The Sun.

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