Somewhat predictable decree? (5)
I believe the answer is:
edict
'decree?' is the definition.
(synonyms)
'somewhat predictable' is the wordplay.
'somewhat' indicates a hidden word.
'EDICT' can be found hidden inside 'predictable'.
(Other definitions for edict that I've seen before include "Regulation" , "Authoritative ruling" , "Proclamation, law" , "Legally binding command" , "Cited (anag) - proclamation" .)