Group of three (4)
'group of three' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for trio that I've seen before include "father, spirit and son" , "Small group playing" , "Riot (anag)" , "Threesome" , "Chamber group" .)
'group of three' is the definition.
(group of three things)
This is the entire clue.
(Other definitions for triad that I've seen before include "Could be major" , "Up to date" , "Criminals" , "three making a sound?" , "Set of three; chord" .)
'group of three' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for trinity that I've seen before include "Cambridge college founded by Henry VIII" , "House" , "God" , "Term" , "Holy triad" .)
'group of three' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for triplet that I've seen before include "Handful of notes" , "Not the only baby in the group" , "Baby with two similar siblings" , "One of several arriving together" , "One of three born together" .)