Live at Bourne End, as a worker (3)
I believe the answer is:
bee
'a worker' is the definition.
(a worker bee)
'live at bourne end' is the wordplay.
'live' becomes 'be' (synonyms).
'at' means one lot of letters go next to another.
'end' indicates one should take the final letters.
The final letter of 'bourne' is 'e'.
'be'+'e'='BEE'
'as' is the link.
(Other definitions for bee that I've seen before include "queen, perhaps" , "Busy person" , "Social insect" , "Social worker possibly" , "In one's bonnet, it's a persistent idea" .)