Step right up and go over (5)
I believe the answer is:
recap
'go over' is the definition.
(I've seen this before)
'step right up' is the wordplay.
'step' becomes 'pace' (synonyms).
'right' becomes 'r' (common abbreviation).
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'pace'+'r'='pacer'
'pacer' back-to-front is 'RECAP'.
'and' is the link.
(Other definitions for recap that I've seen before include "play again" , "Quickly run through" , "Epitomize" , "Go over old ground" , "Summarise at the end" .)