Last English worker (3)
I believe the answer is:
bee
'worker' is the definition.
(a worker bee)
'last english' is the wordplay.
'last' becomes 'be' (I've seen this in other clues).
'english' becomes 'E' (abbreviation as in OED).
'be'+'e'='BEE'
(Other definitions for bee that I've seen before include "Four-winged insect" , "In one's bonnet, it's a persistent idea" , "Useful insect" , "See 17" , "Busy person" .)