I am having my picture taken before party gets very loud and mad (7,3)
I believe the answer is:
cheesed off
'i am having my picture taken' is the definition.
I can't tell whether this definition defines the answer.
'party gets very loud and mad' is the wordplay.
'party' becomes 'do' (do can informally mean a party).
'gets' is a charade indicator (letters next to each other).
'very loud' becomes 'ff' (musical abbreviation for 'fortissimo', very loud).
'and' is a charade indicator (letters next to each other).
'mad' becomes 'cheese' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'do'+'ff' is 'doff'.
'doff' put after 'cheese' is 'CHEESED OFF'.
'before' acts as a link.
Can you help me to learn more?
(Other definitions for cheesed off that I've seen before include "Bored" , "frustrated" , "Fed up, disgruntled" , "Cross" , "Unhappy" .)