Show behind a short time - now performing (4)
I believe the answer is:
moon
'show behind' is the definition.
(moon can mean to show one's bottom)
'a short time now performing' is the wordplay.
I cannot quite understand how this works, but
'performing' could be 'on' (as in being on stage) and 'on' is found in the answer.
'short time' could be 'mo' (as in 'just a mo') and 'mo' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for moon that I've seen before include "show a lot of cheek" , "down one's pants" , "who headed a religious 29 [CULT]" , "High light" , "Appear listless" .)