Wait and see (3,5)
'wait and see' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for sit tight that I've seen before include "Remain firmly in place, take no action" , "Don't move" , "Keep one's position" , "Informally, remain sedentary, don't act" , "Maintain one's seat" .)
'wait and see' is the definition.
(thesaurus)
This is all the clue.