Without finish (7)
I believe the answer is:
endless
'without finish' is the definition.
('finish' can be 'end' (synonyms) so maybe 'without finish' can be ''endless')
This is all the clue.
(Other definitions for endless that I've seen before include "Going on and on, interminable" , "Everlasting" , "Occurring so frequently so as to seem uninterrupted" , "Sister of Aaron (Exodus)" , "'Eternal, perpetual (7)'" .)