Possibly the same table (4)
I believe the answer is:
mesa
'table' is the definition.
(synonyms)
'possibly the same' is the wordplay.
'possibly' indicates an anagram.
'same' anagrammed gives '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" .)