Scottish dish soldier introduced to old crones (6)
I believe the answer is:
haggis
'scottish dish' is the definition.
(haggis is a Scottish dish)
'soldier introduced to old crones' is the wordplay.
'soldier' becomes 'GI' (term for US soldier).
'introduced to' is an insertion indicator.
'old crones' becomes 'hags' (I've seen this in another clue).
'gi' placed into 'hags' is 'HAGGIS'.
(Other definitions for haggis that I've seen before include "Scottish savoury combining lamb offal and oatmeal" , "Scotland's national dish" , "Dish served piping" , "Scotish sheep dish" , "Scottish delicacy" .)