Times, 25,891.

[red46]

1a, 4words, 4.2.5.4. ??m? ?? G?d?? ?I??, Successfully tackle abuse of power? Stoic might.
1d, 7lets, ??l?d??, Tips from caddie going to young man on green.
3d, 2words, 6.3. ??r?e? ??t, Untutored gathering expelled.
6d, 5lets, ??a??, Form of expression in various languages.
8d, 7lets, ??t????, Thumbin'a lift somewhere in Hertfordshire.
12a, 8lets, ?l???r??, Foul King oddly displaced by cunning ruler.
13a, 6lets, ??????, Child turning away from house with missing person.
15a, 8lets, ?n?c?i??, Inertia in group when leader's gone.

[cashier]

1ac come to grips with
1dn celadon
3dn turned out

[Oldred]

1d celadon

[Obiter]

6 Slang

[Oldred]

8d Hitchin

[cashier]

6dn slang VariouS LANGuages
8dn Hitchin

[Oldred]

12a oligarch

[Oldred]

15a in (f)action

[cashier]

12ac oligarch

13ac claptrap
15ac inaction

[Lie-in King]

1a Come to grips with - anag 'power Stoic might'
13a No-show
1d Celadon - 'c(addi)e' (tips) + 'lad on'
3d Turned out - anag 'untutored'
6d "variou S LANG uages"
8d Hitchin(g)
12a Oligarch - odd letters of 'fOuL kInG' removed + 'arch' ( cunning)
13a No-show - 'son' (turning) + 'ho(use) w(ith)'
15a In-(f)action

[red46]

What a team. Thank you all very much for your help.