Funny how both entries so far have had the same
MISSINGLINK21AFinal piece that ties everything together... and a hint to the starred clues in this puzzle.
[-----------] revealer (SLINK in that sense was new to me!). Having
ONEPIN8DTarget for a strike?
[------] left feels like more of a "spare" thing than "strike", so maybe a clue like "Only thing left to spare?" would be more fitting (though "strike" definitely allows for a more vague/punny clue)