Determination to see power slipping from grasp with time (4)
I believe the answer is:
grit
'determination' is the definition.
(I've seen this before)
'power slipping from grasp with time' is the wordplay.
'power' becomes 'p'.
'slipping from' is a deletion indicator.
'grasp' becomes 'grip' (synonyms).
'with' is a charade indicator (letters next to each other).
'time' becomes 't' (abbreviation).
'grip' with 'p' removed is 'gri'.
'gri'+'t'='GRIT'
'to see' is the link.
(Other definitions for grit that I've seen before include "Guts and gumption" , "Coarse sandstone - strength of character" , "Courage (needed by chickens?)" , "Fragments to sprinkle on roads" , "Courage; tiny stones" .)