UN squabbled about splitting bill for cheap fare? (6,3,6)
I believe the answer is:
bubble and squeak
'cheap fare?' is the definition.
(bubble and squeak is a cheap meal)
'un squabbled about splitting bill' is the wordplay.
'about' is an anagram indicator.
'splitting' indicates putting letters inside.
'bill' becomes 'beak' (synonyms).
'un'+'squabbled'='unsquabbled'
'unsquabbled' with letters rearranged gives 'ubbleandsqu'.
'ubbleandsqu' placed within 'beak' is 'BUBBLE-AND-SQUEAK'.
'for' is the link.
(Other definitions for bubble and squeak that I've seen before include "course" , "breakfast?" , "Dish of leftovers" , "food" .)