Remarkable achievement: chef's last to have a meal (4)
I believe the answer is:
feat
'remarkable achievement' is the definition.
(I've seen this in another clue)
'chef's last to have a meal' is the wordplay.
'last' says to take the final letters.
'to have a meal' becomes 'eat' (I've seen this in another clue).
The last letter of 'chef' is 'f'.
'f'+'eat'='FEAT'
(Other definitions for feat that I've seen before include "Significant achievement" , "Deed; achievement" , "Exploit; achievement" , "Achievement needing skill, strength, etc." , "Achievement needing great courage or skill" .)