Queen or drone (3)
I believe the answer is:
bee
I believe this is a double definition.
'queen' is the first definition.
(queen bee is a type of bee)
'drone' is the second definition.
(I've seen this in another clue)
(Other definitions for bee that I've seen before include "Honey maker" , "In one's bonnet, it's an obsessive idea" , "Hymenopterous insect" , "Insect that bumbles?" , "See 17" .)