Minister’s adviser regularly gets suit (6)
I believe the answer is:
spades
'suit' is the definition.
(playing card suit)
'minister's adviser regularly gets' is the wordplay.
'minister's adviser' becomes 'SPAD' (abbreviation for special adviser in politics).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternating letters of 'gets' are 'es'.
'spad'+'es'='SPADES'
(Other definitions for spades that I've seen before include "Card suits and shovels" , "Digging implements" , "Implements for a suit" , "Card suit and sturdy shovels" , "Garden tools and card suit" .)