1: Small piece of fish (3)

3: Last words from some hidden voices (5)

5: Hospital doctors bury bridge partners (7)

7: Large cab I maneuvered, following a set of rules (9)

9: Insignificant trial includes six from old Rome (7)

11: To discover how far in they were, he thumped roughly without hesitation. (5)

12: How to get around doing business, essentially (3)

1: Freaky and tailless, Satan sits on worker (7)

2: Person believing - except for Satanic evil (5)

3: Prove guess in outright delight (9)

4: Vicar regularly outdated technology (1.1.1.)

6: Not much time for supporters (7)

8: Unscripted part for head librarian (2,3)

10: A representative may be a scamp (3)