Across
1 Language spoken mostly by a follower (5) VOCAB
4 Female film star, likable, selling every other product (9) FACTORIAL
9 Unexpectedly met a queen? Probably not (3,4) RAN INTO
10 The day before holiday is a high point (7) EVEREST
11 Oriental travelling around Cambodia in a cargo vessel (3-6) OIL-TANKER
12 Reason one national umpire retires (5)
13 Main issue with summer perhaps (6)
15 Be replacing a dirty old man (5,3) UNCLE [-a](+BE)N
18 Lacking batting confidence without any centuries (2,4,2)
19 A small change in gradient (6)
22 Uniform gets old on the outside, yet fits (5)
24 Thought highly of ad Reuters released (9)
26 Table Hannibal's madness at heart (7)
27 Primarily one among rowing sport's crew (7)
28 Thoroughbred slipped off deep ridge (9)
29 Marks from screeching wheels (5)
Down
1 In transit, our visa is different (7) VARIOUS*
2 Ditch pail by a lake (5)
3 Pelting along through vacant city (9) BA(NGALO*)RE
4 Bunches of phlox picked up (6)
5 Settling in a wooded area without trees (8) CLEARING [2]
6 Daggers made of Nobelium (5)
7 Fine unconventional story is beyond words (9) (INEF*)(FABLE)
8 After losing openers, Slater ton in due course (5,2)
14 A new study written up about Oz is made public (9)
16 Stalwart's tackled a backbreaker (4,5)
17 Carry on sneakily unnoticed for the most part (8)
18 Friend and supporter, one upset and confused (2,1,4)
20 Planned operation from top to bottom to restrain papers getting news (7)
21 What breaks strong watch? (6)
23 Made in China mouth organ girl finds no good (5)
25 Odd part of ball or dance (5)