Conservative head bracketing MP with a colleague (9)
I believe the answer is:
companion
'colleague' is the definition.
(thesaurus)
'conservative head bracketing mp with a' is the wordplay.
I cannot really see how this works, but
'conservative' could be 'mp' (Member of Parliament) and 'mp' is present in the answer.
'a' could be 'an' and 'an' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for companion that I've seen before include "Mate (maybe of honour!)" , "person with whom one is travelling?" , "Person who lives or travels with you" , "Ladder" , "Fellow traveller" .)