The Bees’ best bits? (5)
I believe the answer is:
knees
'the bees' best bits?' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps they are linked in a way I don't understand?
This is all the clue.
Can you help me to learn more?
(Other definitions for knees that I've seen before include "Legs' joints" , "Leg joints" , "Hinged joints" , "Lap" , "Hinge joints" .)