Blow ration after late meal with no starter (8)
I believe the answer is:
uppercut
'blow' is the definition.
(uppercut is a kind of blow)
'ration after late meal with no starter' is the wordplay.
'ration' becomes 'cut'.
'after' is a charade indicator (letters next to each other).
'late meal' becomes 'supper' (I've seen this before).
'with no starter' means to remove the first letter.
'supper' with its first letter removed is 'upper'.
'cut' put after 'upper' is 'UPPERCUT'.
(Other definitions for uppercut that I've seen before include "Punch delivered vertically to chin" , "A vertical punch to chin delivered by boxer" , "one must take it on the chin" , "Boxing blow delivered to chin from below" , "Boxer's blow" .)