Show your backside - though I never do (4)
I believe the answer is:
moon
This clue might be a double definition.
'show' is the first definition.
(I know that moon is a more specific form of the action display)
'your backside though i never do' is the second definition.
I know that 'backside' relates to this answer.
Can you help me to learn more?
(Other definitions for moon that I've seen before include "down one's pants" , "Remove boxers, maybe" , "low point" , "Idle (around) - satellite" , "Phoebe" .)