Speculator finds papal decree (4)
I believe the answer is:
bull
I believe this is a double definition.
'speculator' is the first definition.
(I've seen this in other clues)
'papal decree' is the second definition.
(I've seen this in another clue)
'finds' acts as a link.
(Other definitions for bull that I've seen before include "Large quadruped" , "Male elephant, say" , "One charging" , "Papal proclamation" , "Male animal" .)