Stress that could produce misshape (8)
I believe the answer is:
emphasis
'stress' is the definition.
(I know that accent can be written as emphasis)
'that could produce misshape' is the wordplay.
'that could produce' indicates anagramming the letters.
'misshape' with letters rearranged gives 'EMPHASIS'.
(Other definitions for emphasis that I've seen before include "Special importance or significance" , "Stress, accentuation" , "Stress given to a word" , "Stress laid on, eg, words" , "Stress - misshape (anag)" .)