Lure agency worker to join top table (5)
I believe the answer is:
tempt
'lure' is the definition.
(I know that lure can be written as tempt)
'agency worker to join top table' is the wordplay.
'agency worker' becomes 'temp' (temporary worker sent from an agency).
'to join' is a charade indicator (letters next to each other).
'top' suggests taking the first letters (in a down clue, the first letter is top).
The initial letter of 'table' is 't'.
'temp'+'t'='TEMPT'
(Other definitions for tempt that I've seen before include "Whet the appetite" , "Invite" , "Scaly mammal" , "Allure, entice" , "Attract, charm, entice" .)