Sea contained by shrinking in funny business (6)
I believe the answer is:
comedy
'funny business' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?
'sea contained by shrinking' is the wordplay.
'sea' becomes 'med' (short for Mediterranean).
'contained by' means one lot of letters goes inside another.
'shrinking' becomes 'coy' (both can mean shy).
'med' going within 'coy' is 'COMEDY'.
'in' is the link.
Can you help me to learn more?
(Other definitions for comedy that I've seen before include "Funny and/or happy play" , "provides amusement" , "Light amusing play or film" , "film like Doctor in the House" , "A funny play or farce" .)