Place of secret laughter (6)
I believe the answer is:
sleeve
'place of secret laughter' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
This is all the clue.
Can you help me to learn more?
(Other definitions for sleeve that I've seen before include "Some wear their heart on it" , "It's attached to the armhole" , "Part of a shirt or jacket" , "An arm goes into it - or a music album" , "Part of a garment covering the arm" .)