Accuse government head surrounded by a right shower (7)
I believe the answer is:
arraign
'accuse' is the definition.
(arraigning is a kind of accusing)
'government head surrounded by a right shower' is the wordplay.
'head' indicates taking the first letters.
'surrounded by' is an insertion indicator.
'right' becomes 'r' (common abbreviation).
'shower' becomes 'rain' ('rain shower' can be a synonym of 'shower'**).
The first letter of 'government' is 'g'.
'a'+'r'+'rain'='arrain'
'g' put within 'arrain' is 'ARRAIGN'.
(Other definitions for arraign that I've seen before include "Act against" , "Call to account" , "Accuse of a wrong" , "Call before court to answer criminal charge" , "Bring to trial" .)