Journey allowed three similar things (7)
I believe the answer is:
triplet
'three similar things' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'journey allowed' is the wordplay.
'journey' becomes 'trip' (trip is a kind of journey).
'allowed' becomes 'let' (to let is to allow or permit).
'trip'+'let'='TRIPLET'
Can you help me to learn more?
(Other definitions for triplet that I've seen before include "One of several arriving together" , "Group of three equal notes" , "Set of three things" , "One of a set of three" , "Handful of notes" .)