Starters of organic cod eaten -- and now the main (5)
I believe the answer is:
ocean
'main' is the definition.
(synonyms)
'starters of organic cod eaten and now' is the wordplay.
'starters of' indicates taking the first letters.
The first letters of 'organic cod eaten and now' is 'OCEAN'.
'the' acts as a link.
(Other definitions for ocean that I've seen before include "Huge body of water" , "Great sea" , "Immense expanse or quantity" , "Big sea" , "Large area of water" .)