Actor, late, ultimately resents prompts (7)
I believe the answer is:
reminds
'prompts' is the definition.
('remind' can be a synonym of 'prompt')
'actor late ultimately resents' is the wordplay.
'ultimately' indicates one should take the final letters.
'resents' becomes 'minds' (I've seen this in another clue).
The final letters of 'actor late' are 're'.
're'+'minds'='REMINDS'
(Other definitions for reminds that I've seen before include "Prompts" , "Calls up memory" , "Evokes a memory" .)