Order forecast, ignoring PR (5)
I believe the answer is:
edict
'order' is the definition.
('edict' can be a synonym of 'order')
'forecast ignoring pr' is the wordplay.
'forecast' becomes 'predict' ('predict' can be a synonym of 'forecast').
'ignoring' indicates named letters should be taken away.
'predict' with 'pr' taken away is 'EDICT'.
(Other definitions for edict that I've seen before include "Authoritative ruling" , "Formal order" , "Formal announcement" , "Order issued by an authority" , "Legally binding command" .)