1: Falstaff's first clever lie (5)
5: Keep firm about the ring (5)
8: Declare leniency even heartless to be this! (7)
10: Help to lift weight - this might show how (7)
11: Teen unclothes poorly dressed diners (13)
13: Mr Stewart on the staff (3)
15: Alice, Val or 10-across exploit lotus-eating? (2,5,4)
17: Steer TS into alternative routes (4,7)
19: Novel deviance in the movie? (5,2,6)
23: Opposite qualifier, back off at single error (7)
25: A fool, for instance, may use a very good spear (7)
26: Church assembly contributing to heresy? No dice! (5)
27: Take Chair in university (3)
28: This identifies the literary epic at the outset! (5)