Badly torn during struggle for some time (9)
I believe the answer is:
fortnight
'some time' is the definition.
(two weeks)
'badly torn during struggle' is the wordplay.
'badly' indicates anagramming the letters.
'during' is an insertion indicator.
'struggle' becomes 'fight' (synonyms).
'torn' with letters rearranged gives 'ortn'.
'ortn' inserted within 'fight' is 'FORTNIGHT'.
'for' is the link.
(Other definitions for fortnight that I've seen before include "Half a lunar month" , "couple of weeks" , "Two weeks" , "short period?" , "Period of time" .)