Crossword Puzzle Membership proof

Clue: Membership proof

Proof of membership, maybe (PIN with 3 letters)
"The proof . . . ___ the eating" (ISIN with 4 letters)
Business that requires union membership before hiring (CLOSEDSHOP with 10 letters)
"Leave in," to a proofer (STET with 4 letters)
Proofs of age (IDS with 3 letters)
Membership costs (FEES with 4 letters)
Printer's proof, briefly (REPRO with 5 letters)
Ad proof (TEARSHEET with 9 letters)
Proofreading notation (e.g. DELE with 4 letters)
Membership cost (e.g. DUES with 4 letters)