Rickety chair included in bill is very old (7)
I believe the answer is:
archaic
'very old' is the definition.
(I've seen this before)
'rickety chair included in bill' is the wordplay.
'rickety' is an anagram indicator.
'included in' indicates putting letters inside.
'bill' becomes 'ac'.
'chair' with letters rearranged gives 'rchai'.
'rchai' put into 'ac' is 'ARCHAIC'.
'is' acts as a link.
(Other definitions for archaic that I've seen before include "Antiquated" , "Obsolete" , "Antiquarian" , "Ancient or out of date" , "Belonging to former times like some words" .)