Don't go with Conservative whip (5)
I believe the answer is:
clash
'don't go' is the definition.
(I've seen this in another clue)
'with conservative whip' is the wordplay.
'with' says to put letters next to each other.
'conservative' becomes 'C' (UK political abbreviation).
'whip' becomes 'lash' (synonyms).
'c' put next to 'lash' is 'CLASH'.
(Other definitions for clash that I've seen before include "Mismatch" , "Disagree violently" , "Conflict; be incompatible" , "Come together discordantly" , "(Of colours) look inappropriate together" .)