cossword clue

[oliver??]

french phrase literally meaning to the fact

[BigMac]

Number of letters required int he answer would help, plus any letters you already have.

But try Au fait as a starter.

[BigMac]

PS - might get a quicker response if you name the crossword and put your question in the Quizzes and Puzzles section.

[factor-fiction]

au fait is the nearest