Indian dish initially chucked in sea (6)
I believe the answer is:
baltic
'sea' is the definition.
(I know that Baltic is an marginal sea)
'indian dish initially chucked' is the wordplay.
'indian dish' becomes 'balti' (I've seen this before).
'initially' suggests taking the first letters.
The first letter of 'chucked' is 'c'.
'balti'+'c'='BALTIC'
'in' is the link.
(Other definitions for baltic that I've seen before include "Coming from Tallinn, perhaps" , "North European sea" , "Near land-locked sea of Scandinavia" , "Sea of northern Europe" , "Almost land-locked sea of Scandinavia" .)