camp follower

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++ˈcamp ˌfollower noun [countable]  especially British EnglishSUPPORT A PERSON, GROUP, OR PLAN someone who supports an organization or a political party, but who is not actually a member of it 追随者，支持者〔支持某组织或政党，但不是其成员〕

Examples from the Corpus

camp follower• Whether neighbour, camp follower or convenient snack, the wolves changed little as their owners were transformed.

ˈcamp ˌfollower nounChineseSyllable  

or supports someone organization who a Corpus an

camp follower
ˈcamp ˌfollower noun [countable]
especially British English someone who supports an organization or a political party, but who is not actually a member of it

camp followerBrE /ˌkæmp ˈfɑːləʊə(r)/ 🔊NAmE /ˌkæmp ˈfɑːloʊər/ 🔊 nouna person who supports a particular group or political party but is not a member of it （支持某一团体或政党但并非其正式成员的）追随者(in the past) a person who was not a soldier but followed an army from place to place to sell goods or services （旧时的）随军商贩，随军杂役