This paste needs salt with a mixture of spices, thanks (12)
I believe the answer is:
'this paste' is the definition.
(I have seen 'fishy paste' mean 'taramasalata' so perhaps 'paste' could also mean 'taramasalata')
'salt with a mixture of spices thanks' is the wordplay.
'salt' becomes 'tar' (both can informally mean a sailor).
'with' says to put letters next to each other.
'mixture of spices' becomes 'masala' (mixture of spices in Indian cooking).
'thanks' becomes 'ta' (UK informal version of 'thank you').
'needs' is the link.
(Other definitions for taramasalata that I've seen before include "starter" , "fishy paste" , "spread" , "Pink Greek food" , "Fishy Greek dip" .)