I hate that element of roughness! (3)
I believe the answer is:
ugh
'i hate that' is the definition.
(exclamation of disgust)
'element of roughness' is the wordplay.
'element of' says the answer is hidden in the clue (I've seen this in other clues).
'UGH' can be found hidden inside 'roughness'.
(Other definitions for ugh that I've seen before include "How repulsive!" , "It's nasty" , "That's disgusting!" , "Yuck (colloq.)" , "Exclamation of disgust arising from hug" .)