Around start of Oktoberfest the diet is going to pot — prompting help? (5,5)

'prompting help?' is the definition.
(card used to prompt speakers or actors )

'around start of oktoberfest the diet is going to pot' is the wordplay.
'around' means one lot of letters goes inside another.
'start of' indicates taking the first letters.
'going to pot' indicates anagramming the letters.
The initial letter of 'oktoberfest' is 'o'.
'the'+'diet'+'is'='thedietis'
'thedietis' anagrammed gives 'iditsheet'.
'o' going within 'iditsheet' is 'IDIOT SHEET'.