Go without a small, sweet dish (5,7)
I believe the answer is:
pease pudding
'go without a small sweet dish' is the definition.
I can't judge whether this defines the answer.
'go without a small sweet dish' is the wordplay.
'go' becomes 'pee' (both can mean to urinate).
'without' is an insertion indicator ('without' can be similar in meaning to 'outside').
'small' becomes 's' (abbreviation - e.g. clothes size).
'sweet dish' becomes 'pudding' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a'+'s'='as'
'pee' going around 'as' is 'pease'.
'pease'+'pudding'='PEASE-PUDDING'
Can you help me to learn more?
(Other definitions for pease pudding that I've seen before include "Soaked and boiled dish served with ham or pork" , "Dish of strained pulses mixed with egg" , "Mashed vegetable dish" .)