A piece of furniture to remain alongside corridor (9)

'a piece of furniture' is the definition.
(I know that hallstand is a type of article of furniture)

'remain alongside corridor' is the wordplay.
'remain' becomes 'stand' (standing is a kind of remaining).
'alongside' means one lot of letters go next to another.
'corridor' becomes 'hall' (hall is a kind of corridor).
'stand' put after 'hall' is 'HALLSTAND'.

'to' acts as a link.