17 April - Solution for the last clue and the next cryptic crossword clue

Ploy revealed by doctor during walk (6)

Solution – gambit

You find "mb" (an abbreviation for doctor) during or in "gait" for walk and so get to "gambit" for ploy.

Today’s cryptic crossword clue – solution tomorrow

Unnecessary to pierce ends of sacs (8)

Hint – this is a charades clue