Pained look of red maybe bored by Conservative (5)
I believe the answer is:
wince
'pained' is the definition.
(I've seen this before)
'look of red maybe bored by conservative' is the wordplay.
I cannot quite see how this works, but
'conservative' could be 'c' (UK political abbreviation) and 'c' is found in the answer.
'red' could be 'wine' (wine is a kind of red) and 'wine' is found within the remaining letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for wince that I've seen before include "Shrink" , "Pull a face" , "Start back in pain" , "React involuntarily from pain or embarrassment" , "Make face showing pain" .)