Across

1 Inclined to ritual, greeting Charlotte audibly? (4,6)
8 Provide with means to get Ben drunk with ale (6)
9 Frost that's about to go round peninsula (6)
10 We hear you will feast (4)
11 Point made by senior cleric (8)
12 Gentle river having no pollution (4)
13 West Indian sounds well-grounded? (5,5)
15 Proof of purchase on said seat (7)
17 Adam ran off fast (7)
20 Orthodox Roman Catholic, I'd be found in river in the Orient (10)
22 Destiny of corpulent European (4)
23 Long aria performed for Queen Elizabeth I (8)
25 Front section removed from track that is not very good (4)
26 Big company - one foolish or wise? (6)
27 Pattern of OT law (6)
28 Dieter eats unrestrainedly during period after Lent (10) 

Down

1 One of three persons not to be taken away, requested psalmist (4,6)
2 Such a retreat harbours this beast (4)
3 Not her being heard in song of praise (4)
4 Minister keeps a source of power (7)
5 Viola finds the seas are rough (10)
6 Naughty gal with Lucian name-dropping Roman emperor (8)
7 It will fail the acid test (6)
9 Entering tabernacle, Richard Priest (6)
13 Remorse concerning punishment, about time (10)
14 Devoted actor with scene rewritten (10)
16 Ned played church instrument - some nerve ending up here? (3,5)
18 One cleric with whom another keeps company (6)
19 With regard to two endorsements, one being deficient (3-1-3)
21 Undergarment to go round and round leg (4-2)
24 Leaves producer in the forest (4)
25 Liquid measure found in religious books (4)

Last week's solution