Colonist, a hero, bringing remedy? (7)
I believe the answer is:
antacid
'remedy?' is the definition.
(thesaurus)
'colonist a hero' is the wordplay.
'colonist' becomes 'ant' (I've seen this before).
'hero' becomes 'cid' (I've seen this in other clues).
'ant'+'a'+'cid'='ANTACID'
'bringing' is the link.
(Other definitions for antacid that I've seen before include "Indigestion cure" , "Medicine to settle the stomach" , "Substance used to treat stomach upsert" , "calming agent" , "Indigestion relief" .)