| ASCERTAIN | Establish for sure (9) |
| NAILDOWN | Establish for definite (4,4) |
| PROVIDE | Establish for a fact I'd been in to cater (7) |
| FORESHORE | For sure, it sounds like a good place for wildfowling (9) |
| UNFAILING | Fun unfortunately suffering for sure (9) |
| OBVIOUSLY | Oboe, violin up 50% - devious for sure (9) |
| DOUBTLESS | For sure empty - US's bold moves (9) |
| CERTAINLY | Of course, for sure (9) |
| ENCLOSURE | It surrounds a clone for sure! (9) |
| CONFIDENT | Tory uncertainty brought about negative effect for sure (9) |
| CERTAINTY | Tiny trace gets wasted, that's for sure (9) |
| TREASURES | Stare for sure but they're certainly prized (9) |
| PRECISELY | For sure |
| FOOLPROOF | Game of pool? For sure! |
| CONVINCED | Prisoner struggled, clutching neck at intervals, for sure |
| NORTHPOLE | Maybe only Santa Claus knows for sure whether Peary, Byrd, or Amundsen got here first (5,4) |
| NOTWOWAYS | What can't be said of a palindrome, for sure (5,3,2,3,4,5,2) |
| NATTURNER | Honoree of an 1884 poem by T. Thomas Fortune with the lines "Let tyrants quake, e'en in their power / For sure will come the awful hour" |
| REGIUSPROFESSOR | Senior academic, awful gossiper for sure (6,9) |
| GOLFCOURSE | Front of garage, for sure, including large area for drivers (4,6) |
