Organising a UK BBQ: sunbed, ale, something to eat (6,3,6)
I believe the answer is:
bubble and squeak
'something to eat' is the definition.
(bubble and squeak is a kind of food)
'organising a uk bbq sunbed ale' is the wordplay.
'organising' is an anagram indicator.
'a'+'uk'+'bbq'+'sunbed'+'ale'='aukbbqsunbedale'
'aukbbqsunbedale' anagrammed gives 'BUBBLE-AND-SQUEAK'.
(Other definitions for bubble and squeak that I've seen before include "food" , "breakfast?" , "course" , "Dish of leftovers" .)