Dog's breakfast before ex-PM's breakfast, perhaps (4,6)
I believe the answer is:
hash browns
'breakfast perhaps' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'dog's breakfast before ex-pm's' is the wordplay.
'dog's breakfast' becomes 'hash' (I can't justify this - if you can you should give a lot more credence to this answer).
'before' is a charade indicator (letters next to each other).
'ex-pm's' becomes 'browns' (Gordon Brown).
'hash'+'browns'='HASH BROWNS'
Can you help me to learn more?
(Other definitions for hash browns that I've seen before include "potato dish" , "breakfast? Part of it, perhaps" .)