Possible Clues:

• Museum honcho
• Warden's list put up with despicable person at the top
• Custodian of a collection
• Censor's right to muzzle old city museum boss
• Actor performing outside old city with arty worker
• Person in museum initially consulted on our art, possibly
• Exhibition custodian
• Arty worker, unionist traitor with nothing, is in credit
• Guardian's dog has a canker returning
• Keeper employed by wretch given a rise