Piece of wood going around table (8,5)
I believe the answer is:
skirting board
'piece of wood' is the definition.
(piece of wood running round a room)
'going around table' is the wordplay.
'going around' becomes 'skirting' (to skirt something is to go around it).
'table' becomes 'board' (board is a kind of table).
'skirting'+'board'='SKIRTING-BOARD'
(Other definitions for skirting board that I've seen before include "Wooden strip running round the room" , "Edge along an interior wall" , "Item of decor" , "Feature around room" , "Wood at base of wall" .)