Couple that is getting married — about time (4)
I believe the answer is:
item
'couple' is the definition.
(I've seen this before)
'that is getting married about time' is the wordplay.
'that is' becomes 'ie' ('i.e.' can be a synonym of 'that is').
'getting married' becomes 'm' (I've seen this in other clues).
'about' indicates putting letters inside.
'time' becomes 't'.
'ie'+'m'='iem'
'iem' going around 't' is 'ITEM'.
(Other definitions for item that I've seen before include "Detail - entry" , "Particular" , "Two lovers as one" , "Object; piece" , "Boyfriend and girlfriend" .)