Supporter should face facts, for the most part (5)
I believe the answer is:
strut
'supporter' is the definition.
(I've seen this before)
'should face facts for the most part' is the wordplay.
I cannot really see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
'part' could be 'ut' (ut is a kind of part) and 'ut' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for strut that I've seen before include "Supporting rod" , "Longitudinal brace" , "that provides support" , "(Walk with) a stiff pompous gait" , "Trust (anag.)" .)