Said to be a governmental deputy-head (6)
I believe the answer is:
stated
'said' is the definition.
('state' can be a synonym of 'say')
'a governmental deputy-head' is the wordplay.
'a governmental' becomes 'state' (I've seen this in another clue).
'deputy-head' becomes 'd' (head letter of 'deputy-').
'state'+'d'='STATED'
'to be' acts as a link.
(Other definitions for stated that I've seen before include "Specified" , "Declared or asserted" , "Said firmly, averred" , "Expressed in written or spoken words" , "Uttered, expressed in words" .)