Page secured by older office appliance (7)
I believe the answer is:
stapler
'office appliance' is the definition.
'page secured by older' is the wordplay.
'page' becomes 'p'.
'secured by' is an insertion indicator (inserted letters are held or secured).
'older' becomes 'staler' ('stale' can be similar in meaning to 'old').
'p' put inside 'staler' is 'STAPLER'.
(Other definitions for stapler that I've seen before include "Office equipment - plaster (anag)" , "Office fastener" , "Implement for inserting paper fasteners" , "Item of office equipment" , "It's used to attach leaves" .)