From outer space, will it arrive at mid-century? (5)
I believe the answer is:
comet
'from outer space will it' is the definition.
I can't tell whether this definition defines the answer.
'arrive at mid-century?' is the wordplay.
'arrive' becomes 'come' (synonyms).
'at' is a charade indicator (letters next to each other).
'mid' says to take the centre (mid- can mean the middle of something).
The central letter of 'century' is 't'.
'come'+'t'='COMET'
Can you help me to learn more?
(Other definitions for comet that I've seen before include "Plane" , "Celestial object" , "Dancer's colleague" , "potential space invader" , "Frozen body" .)