Salt recollected in sea song (9)
I believe the answer is:
seasoning
'salt' is the definition.
(thesaurus)
'recollected in sea song' is the wordplay.
'recollected' indicates anagramming the letters (letters recollected and rearranged).
'in'+'sea'+'song'='inseasong'
'inseasong' anagrammed gives 'SEASONING'.
(Other definitions for seasoning that I've seen before include "Add it to give flavour" , "Food flavouring" , "Could be salt" , "salt, for example" , "Relish" .)