Across
1
Greek Muse: sister to Erato, Terpsichore, etc (4)
9
Easing of tensions between nations (7)
11
US state, one of the original 13 colonies... (3,9)
15
Applause, please (4,1,3,4)
19
The Merchant of Venice
(7)
20
Irreconcilables; extreme traditionalists (8)
21
Fool, idiot (Brit informal) (4)
Down
1
Pseudonym used for convenience, economy or secrecy (4,4)
2
Having someone distracting or unwelcome 'along for the ride' (2,3)
4
Make a grand slam; win everything (5,3,5)
5
Take in the tourist attractions (3,3,6)
7
William ----: overture by Rossini
(4)
8
Leo Tolstoy's great novel of 1878, spawning numerous feature films (4,8)
12
Accustomed to, or familiar with, a particular thing (4,2,2)
16
Spiro T -----, US Vice-President who resigned in 1973 (5)
17
George ----, novelist (aka Amantine Dupin), associated with Chopin (4)