Place the wrong way up on a table top (3)
I believe the answer is:
put
'place' is the definition.
(synonyms)
'wrong way up on a table top' is the wordplay.
'wrong way' shows that the letters should be reversed in order.
'up on' becomes 'up' (similar in meaning).
'top' indicates taking the first letters (in a down clue, the first letter is top).
The first letter of 'table' is 't'.
'up' in reverse letter order is 'pu'.
'pu'+'t'='PUT'
'the' acts as a link.
(Other definitions for put that I've seen before include "Place in a position" , "Set (in place)" , "Place in a location" , "Place, lay" , "Place; placed" .)