secret agent rubber stamp

abettor abstruse actor advocate agency agent ambassador ambiguous arcane assistant attorney broker camouflaged classified clerk cloakanddagger close closet commissioner concept confidential courier covered covert cryptic dark deep deputy disguised doer emissary esoteric factor furtive gobetween grunge grungy hidden hushhush ink intermediary lawyer minister miscellaneous mysterious mystic mystical negotiator obscure occult officer operative operator outoftheway principal private proctor promoter proxy rectangular red representative rubber salesperson secluded secret servant sign stamp substitute surrogate symbol undercover underground undisclosed unknown unlisted unseen worker