Arrive on time to see streaker? (5)
I believe the answer is:
comet
'streaker?' is the definition.
(something which 'streaks')
'arrive on time' is the wordplay.
'arrive' becomes 'come' (coming is a kind of arriving).
'on' says to put letters next to each other.
'time' becomes 't'.
'come'+'t'='COMET'
'to see' acts as a link.
(Other definitions for comet that I've seen before include "body found in space" , "Long distance traveller" , "Small heavenly body" , "Small celestial body" , "Celestial body with luminous tail" .)