Accuse a right shower, including Government leader (7)
I believe the answer is:
arraign
'accuse' is the definition.
(arraigning is a kind of accusing)
'a right shower including government leader' is the wordplay.
'right' becomes 'r' (common abbreviation).
'shower' becomes 'rain' ('rain shower' can be a synonym of 'shower'**).
'including' is an insertion indicator.
'leader' says to take the initial letters.
The initial letter of 'government' is 'g'.
'rain' placed around 'g' is 'raign'.
'a'+'r'+'raign'='ARRAIGN'
(Other definitions for arraign that I've seen before include "Bring to trial" , "Accuse before tribunal" , "Indict, accuse" , "Bring to court to answer a charge" , "Call to account" .)