Scottish dish is given to witch: good (6)
I believe the answer is:
haggis
'scottish dish' is the definition.
(haggis is a Scottish dish)
'is given to witch good' is the wordplay.
'given to' says to put letters next to each other.
'witch' becomes 'hag' (synonyms).
'good' becomes 'g' (abbreviation).
'hag'+'g'='hagg'
'is' after 'hagg' is 'HAGGIS'.
(Other definitions for haggis that I've seen before include "Indonesian island; computer language" , "Robert Burns' "Great chieftain o' the puddin'-race"" , "traditional meal" , "Burns Night fare" , "Burns's "Great chieftain o' the puddin'-race"" .)