Sunday dinners of grub from Strasbourg (6)
I believe the answer is:
roasts
'sunday dinners' is the definition.
(I've seen this in another clue)
'of grub from strasbourg' is the wordplay.
'of' is an anagram indicator (the answer comes from or 'of' the letters).
'from' suggests deleting specific letters.
'strasbourg' with 'grub' taken out is 'stasor'.
'stasor' is an anagram of 'ROASTS'.
(Other definitions for roasts that I've seen before include "Cooks in dry heat" , "Cooks meat in oven" , "traditional Sunday food" , "gets very hot" , "Has a go at" .)