Ostracise (9)
'ostracise' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for blacklist that I've seen before include "Boycott" , "Proscribe" , "Names of those banned, distrusted" , "(Put on a) roll of people considered untrustworthy" .)
'ostracise' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for blackball that I've seen before include "Negative vote to veto" , "Exclude by a negative vote" , "bar?" , "Refuse to endorse" , "Shut out (of a group)" .)
'ostracise' is the definition.
(I know that ostracise can be written as shun)
This is the entire clue.
(Other definitions for shun that I've seen before include "Deliberately avoid" , "Ostracise" , "Avoid, ignore" , "military command" , "attention in the army" .)
'ostracise' is the definition.
(boycotting is a kind of ostracizing)
This is all the clue.
(Other definitions for boycott that I've seen before include "Same as 22 down, named after English captain" , "Refuse to patronise" , "Blackball" , "Refuse to deal with (someone) as a protest" , "Refuse to deal with - Yorkshire and England batsman" .)