Quickly, Suddenly
adverb
This is the adverb version of the kanji quick, so it means quickly.
さっと
This actually uses the kun'yomi reading, but it's almost the same as the one you learned when you learned the kanji. It's just さっ instead of さつ. If you can remember that さつ gets shortened here, you'll know how to read this!
茜は颯と涙を拭った。
Akane quickly wiped away the tears.