Solving time, 14 mins, SE corner the trickiest.
* = anagram < = reversed
ACROSS
1 BAR (DO) T Lionel and Brigitte
4 MARC(h) US
8 F ETCHING
10 Dolly PART ON
11 POL (IT) E
12 NO RM ALLY RM = Royal Marines – the multiple ‘jolly’s indicating the plural.
13 EDUCATIONIST (nutcase idiot)*
16 SANTO DOMINGO (nomads go into)* Capital of Dominican Republic
20 DECLARER (leer card)*
21 (s)CUTTLE
22 DI (VI) NE
23 EMERITUS (Time sure)* Excellent surface reading
24 LEGAT(e) O Musical term
25 S (P)EE CH
DOWN
1 BR ETON
2 RE C LINE
3 O LIVE (evil)<
5 ASPERSION (no praises)*
6 CERTAIN (I recant)*
7 SHOELESS Cryptic definition
9 GENDARMERI E (dire German)*
14 UNDER FELT 15 is material
15 MATER I A L
17 TELL IN G
18 OUT SIDE
19 PLOUGH Double definition
21 CHEEP “Cheap” Very tricky Definition, cry