Exclamation of frustration, perhaps - it may follow Mamma Mia! (4,2,2,5)
I believe the answer is:
here we go again
'follow mamma mia' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'exclamation of frustration perhaps it' is the wordplay.
I cannot quite see how this works, but
'exclamation' could be 'o' and 'o' is found within the answer.
'perhaps' could be 'eg' (for example) and 'eg' is located in the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is found in the answer.
This explanation may well be incorrect...
'may' acts as a link.
Can you help me to learn more?
(Other definitions for here we go again that I've seen before include "The same thing is reoccurring! (colloq.)" , "Oh no, the same old nonsense" , "how boring" , "The same situation is recurring" , "Leaving for our regular holiday" .)