Scribbled his last and grovelled (8)
I believe the answer is:
scrawled
'scribbled' is the definition.
('scrawl' can be a synonym of 'scribble')
'his last and grovelled' is the wordplay.
'last' says to take the final letters.
'and' is a charade indicator (letters next to each other).
'grovelled' becomes 'crawled' ('crawl' can be a synonym of 'grovel').
The last letter of 'his' is 's'.
's'+'crawled'='SCRAWLED'
(Other definitions for scrawled that I've seen before include "Wrote carelessly in bad handwriting" , "Wrote carelessly with red claws" .)