Do be some politicians! (5)
I believe the answer is:
party
'do' is the definition.
(I've seen this before)
'some politicians' is the wordplay.
'some' becomes 'part' (only part of something).
'politicians' becomes 'y' (I can't explain this - if you can you should believe this answer much more).
'part'+'y'='PARTY'
'be' acts as a link.
Can you help me to learn more?
(Other definitions for party that I've seen before include "Group gathered together for pleasure" , "Social function" , "push the boat out" , "festive" , "Celebratory social gathering" .)