Possibly the same table (4)
I believe the answer is:
mesa
'table' is the definition.
(I know that table can be written as Mesa)
'possibly the same' is the wordplay.
'possibly' indicates an anagram.
'same' is an anagram of 'MESA'.
(Other definitions for mesa that I've seen before include "Flat-topped hill with steep sides, common in the southwestern US" , "Flat hill" , "Flat tableland with steep sides" , "In the US south-west, a steep-sided flat-topped hill" , "Geographical feature" .)