Finished trapping queen bee (5)
I believe the answer is:
drone
'bee' is the definition.
(I know that drone is a type of bee)
'finished trapping queen' is the wordplay.
'finished' becomes 'done' (similar in meaning).
'trapping' is an insertion indicator.
'queen' becomes 'r' (abbreviation for regina, e.g. in ER ).
'done' going around 'r' is 'DRONE'.
(Other definitions for drone that I've seen before include "Male bee for the queen" , "Someone who lives on the labour of others" , "Hum; monotonous talk" , "he gives us a buzz" , "mollusc" .)