Single piece of bedroom furniture you may regret having (3-5,5)
I believe the answer is:
one-night stand
'you may regret having' is the definition.
I can't judge whether this defines the answer.
'single piece of bedroom furniture' is the wordplay.
'single' becomes 'one' (a single thing - only one).
'piece of bedroom furniture' becomes 'nightstand' (I've seen this in another clue).
'one'+'nightstand'='ONE-NIGHT STAND'
Can you help me to learn more?
(Other definitions for one-night stand that I've seen before include "Very short-term affair" , "little time for love" , "Very short "relationship"" , "Singularly brief physical relationship" , "Performance confined to a single evening" .)