For every reversal, stand up and go through it again! (7)
I believe the answer is:
reprise
'go through it again' is the definition.
(to reprise is to go through a piece of music again)
'for every reversal stand up' is the wordplay.
'for every' becomes 'per' ('per' means 'for each' or 'for every').
'reversal' shows that the letters should be reversed in order.
'stand up' becomes 'rise' (synonyms).
'per' back-to-front is 'rep'.
'rep'+'rise'='REPRISE'
'and' acts as a link.
(Other definitions for reprise that I've seen before include "later musical statement" , "(Musically) a repeated passage" , "repeat performance" , "annual charge?" , "Another performance" .)