Bitter additive for seasick argonauts (9)
I believe the answer is:
angostura
'bitter additive' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'seasick argonauts' is the wordplay.
'argonauts' anagrams to 'ANGOSTURA'.
Though, I am unsure how this is indicated.
'for' is the link.
Can you help me to learn more?
(Other definitions for angostura that I've seen before include "It makes 8 pink" , "bitter substance" , "An aromatic bark, made bitter tonic" , "Bitters for 13" , "Bitter stuff for Argonauts" .)