I'm beginning to make a habit of this! Last one: 13 dn Mug up one like Tartuffe (5) ?O?TS. The 'T comes from 21 ac Utrillo, but I fail to see the wordplay for that.
Many thanks both. I always used to berate my Dad for not double-checking answers when an apparently indecipherable clue appeared. Hoisted by my own petard on this one!