Team capsizing in sea persist in questioning course (5,5)
I believe the answer is:
mixed grill
'course' is the definition.
(type of dish)
'team capsizing in sea persist in questioning' is the wordplay.
'team' becomes 'XI' (a football team, from Roman numerals for 11).
'capsizing' says the letters should be written in reverse.
'in' means one lot of letters goes inside another.
'sea' becomes 'med' (abbreviation of Mediterranean).
'persist in questioning' becomes 'grill' (grill can mean to question someone).
'xi' written backwards gives 'ix'.
'ix' going inside 'med' is 'mixed'.
'mixed'+'grill'='MIXED GRILL'
(Other definitions for mixed grill that I've seen before include "Meal of assorted meats" , "Sausages, bacon, kidneys, tomatoes, mushrooms, etc" , "Dish of various meats and veg" , "Dish of meats and vegetables" .)