Turned upside down, issue keeping party dish in a mould (7)
I believe the answer is:
timbale
'dish in a mould' is the definition.
(dish cooked in a pastry mould)
'turned upside down issue keeping party' is the wordplay.
'turned upside down' shows that the letters should be reversed in order.
'issue' becomes 'emit' (I've seen this before).
'keeping' means one lot of letters goes inside another.
'party' becomes 'lab' (abbreviation for Labour).
'emit' placed around 'lab' is 'elabmit'.
'elabmit' in reverse letter order is 'TIMBALE'.
(Other definitions for timbale that I've seen before include "pastry dish" , "Minced meat dish" , "Dish cooked in a mould" , "mould in kitchen" .)