Proclamation you'll find in the dictionary (5)
I believe the answer is:
edict
'proclamation' is the definition.
(I know that edict is a type of proclamation)
'in the dictionary' is the wordplay.
'in' indicates the answer is hidden within the clue.
'EDICT' can be found hidden inside 'the dictionary'.
'you'll find' acts as a link.
(Other definitions for edict that I've seen before include "Formal order" , "Authoritative ruling" , "Cited (anag) - proclamation" , "Proclamation, law" , "Declaration" .)