Strive — strife (8)
I believe the answer is:
struggle
I believe this clue is a double definition.
'strive' is the first definition.
(I've seen this before)
'strife' is the second definition.
(thesaurus)
(Other definitions for struggle that I've seen before include "Make vigorous effort under difficulties" , "Strive; compete" , "pains" , "Move limbs in vigorous attempt to get free" , "Grapple, contend" .)