gooseberry-picker

noun2

1. •
   (slang, no longer used) A chaperone.

   • The Solicitor-General: I understand that a gooseberry-picker is the person who stands by whilst a young man and young woman are making love (laughter). — 1869
2. •
   (slang, no longer used) One who works on behalf of another person who takes the credit for the work.