1: Second chunkiest is shortest and thickest (9)
4: Though run over again, MP hasn't died (5)
7: Mimic has to leave the ground (4,3)
10: Writing material on usury: Papacy held it back (7)
11: Rule will end in some paper (5)
12: Friendly over age of consent? (9)
13: We blame knitter for small woolly jumper (3-4)
15: Young birds or seals may be heard (7)
17: A mongrel on a mountain takes care of things. (7)
19: TV's Ellen, upset after last two bits edited out, broke contract (7)
21: A democratic leadership, time after time, is a benefit (9)
23: Bury in the empty sepulcher, eventually (5)
25: Decades established as most uptight (7)
26: New Orleans, an Italian city (7)
27: Padre's sensibly covering attire (5)
28: Very brave, Dorothy's starting without Em perhaps? (9)