Piece of land in Paisley (4)
I believe the answer is:
isle
'piece of land' is the definition.
(I've seen this before)
'in paisley' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ISLE' is hidden within 'paisley'.
(Other definitions for isle that I've seen before include "Geographic location" , "Small area of ground" , "Fair one is in shipping bulletin" , "Small island" , "Land amid water" .)