First of orders signed — sounded like Napoleon? (6)
I believe the answer is:
oinked
'sounded like napoleon?' is the definition.
(Napoleon is a pig in George Orwell's Animal Farm)
'first of orders signed' is the wordplay.
'first of orders' becomes 'o' (1st letter of 'orders').
'signed' becomes 'inked' (inking is a kind of signing).
'o'+'inked'='OINKED'
(Other definitions for oinked that I've seen before include "Made a piglike noise" , "Grunted" , "Sounded like pig pen" , "Made sound like cartoon pig" , "Made noise like cartoon pig" .)