Goal: to introduce odd leading elements - quite a lot (4,4)
I believe the answer is:
good deal
'lot' is the definition.
(I know that lot can be written as good deal)
'goal to introduce odd leading elements' is the wordplay.
'to introduce' indicates putting letters inside (to introduce to can mean to insert or include).
'leading' says to take the initial letters (the leading letter of the word).
The first letter of 'elements' is 'e'.
'odd'+'e'='odde'
'goal' placed around 'odde' is 'GOOD DEAL'.
'quite a' is the 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 good deal that I've seen before include "Large number" , "A lot may" , "satisfactory transaction" .)