Initially has a good gig in summer making savoury pudding (6)
I believe the answer is:
haggis
'savoury pudding' is the definition.
(type of Scottish dish)
'initially has a good gig in' is the wordplay.
'initially' indicates taking the first letters.
'good' becomes 'g' (abbreviation).
'gig' becomes 'gis' (I can't explain this - if you can you should believe this answer much more).
'in' means one lot of letters goes inside another.
The first letter of 'has' is 'h'.
'g' inserted within 'gis' is 'ggis'.
'h'+'a'+'ggis'='HAGGIS'
'summer making' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for haggis that I've seen before include "Scottish dish boiled in sheep's stomach" , "Traditional Scottish dish based on sheep's stomach" , "Traditional Scotch pudding" , "traditional meal" , "Scots offal dish" .)