Fan
In a fan, words read across and diagonally. The two longest diagonal words always read from top to bottom. The others all slope to the left or right, as in a star (which see). The length of each side is equal to half the number of clues. The fan is inherently double (see double forms).
Left: Right:
S S E H
N U T O U M O S
P U G A I L R E B U T E
M A M A T U N A O L E O S A M E
J A W B R E A K E R S T A P L E G U N S
C D
R A R E
A Y N E R N
F I N E S L O E
T A R E S S E W E D
Inverted Left: Inverted Right:
B A R B S S E A L S
I L I A T W I T
G O B E R A
B E A R
R K
A R I S T O C R A T S E C O N D B E S T
L I N O T O A D H O R A I T C H
L O O H A M O A K A A R
A T E X N E N O
H R D E