Republican did a test, screening people running for office (10)
I believe the answer is:
candidates
'screening people running for office' is the definition.
I can't tell whether this definition defines the answer.
'republican did a test' is the wordplay.
'CANDIDATES' is hidden within the letters.
But, I'm not sure how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for candidates that I've seen before include "those awaiting interview?" , "Entrants" .)