Without vigour of late? (8)
I believe the answer is:
lifeless
This clue is a double definition.
'without vigour' is the first definition.
(I've seen this before)
'late?' is the second definition.
(I've seen this before)
'of' acts as a link.
(Other definitions for lifeless that I've seen before include "Showing no signs of vitality" , "lacking any vitality" , "late?" , "Lacking animation" , "Passive" .)