Go before page and fall back (7)
I believe the answer is:
precede
'go before' is the definition.
(I've seen this before)
'page and fall back' is the wordplay.
'page' becomes 'p'.
'and' means one lot of letters go next to another.
'fall back' becomes 'recede' (synonyms).
'p'+'recede'='PRECEDE'
(Other definitions for precede that I've seen before include "Occur before" , "Lead the way" , "Go before in time or order" , "go before the others" , "Pave the way" .)