Former PM and bishop getting MDMA, perhaps (5)
I believe the answer is:
maybe
'perhaps' is the definition.
(I know that perhaps can be written as maybe)
'former pm and bishop getting mdma' is the wordplay.
'former pm' becomes 'May' (Theresa May former prime minister).
'and' says to put letters next to each other.
'bishop' becomes 'B' (chess abbreviation).
'getting' is a charade indicator (letters next to each other).
'mdma' becomes 'E' (MDMA is ecstasy, ie 'E').
'may'+'b'+'e'='MAYBE'
(Other definitions for maybe that I've seen before include "Perhaps, might happen" , "Perhaps, possibly" .)