Conservative MP has issues about power (8)
I believe the answer is:
emphasis
'power' is the definition.
'conservative mp has issues about' is the wordplay.
'about' indicates the answer is hidden within the clue.
'EMPHASIS' is hidden within 'conservative mp has issues'.
(Other definitions for emphasis that I've seen before include "Importance; priority" , "Stress, accentuation" , "Stress given to a word" , "Stress - misshape (anag)" , "Weight" .)