Climb on table (5)
I believe the answer is:
board
I believe this clue is a double definition.
'climb on' is the first definition.
(thesaurus)
'table' is the second definition.
(board is a kind of table)
(Other definitions for board that I've seen before include "See 9" , "Go onto (a ship)" , "Supervisory committee" , "Food - table - directors" , "Get on - governing body" .)