Solutions

ACROSS
1 Two-score.
TWO+SCORE
6 Prince.
PRI(N)CE
9 United.
UNI+TED
10 Rosaline.
RO+SALINE (or rev.)
11 Turnpike.
TURN+PIKE
12 Send-up.
S+END UP
13 Pull together.
PULL+TOGETHER
15 Second person.
SECOND+PER+SON
19 Hecuba.
H+E+CUBA
21 Foul play.
FOUL+PLAY
23 Decimate.
D+ECIM+ATE (eat anag.)
24 Esther.
(anag.)
25 Hymnal.
H+YMNA+L (many anag.)
26 Discrete.
DISC+RE+T+E


DOWN
2 Wind-up.
(two meanings)
3 Satan.
S+A+TAN
4 Old Bill.
OLD+BILL
5 Earnest.
(anag.)
6 Pesos.
(anag.)
7 Islington.
IS+LING+TO+N
8 conjurer.
CON+J+U+R+ER
13 Profusion.
PR+O+FUSION
14 Cemetery.
(straight cryptic)
16 Enfield.
E+N+FIELD
17 Squeers.
S+QUEER+S
18 Talent.
TALE+NT
20 Avail.
AVA+I+L
22 Pater.
PATE+R