A loving couple having a riotous time (4)
I believe the answer is:
item
'a loving couple' is the definition.
(I've seen this before)
'a riotous time' is the wordplay.
'a riotous' is an anagram indicator.
'time' is an anagram of 'ITEM'.
'having' is the link.
(Other definitions for item that I've seen before include "Bit of information" , "Individual thing" , "Feature" , "Something on list" , "One thing among many" .)