Last seat? (6)
I believe the answer is:
bottom
This clue is a double definition.
'last' is the first definition.
(eg at the bottom of a list)
'seat?' is the second definition.
('bottom' can be a synonym of 'seat')
(Other definitions for bottom that I've seen before include "Athenian weaver (AMND)" , "Shakespeare's weaver" , "Behind" , "Base; Shakespearean character" , "foot" .)