* The vowel sound in "clasp" is the long "a" sound, as in "father" or "car."
Short vowel sounds are typically represented by the vowel alone (like "a" in "cat") or with a vowel followed by a consonant (like "a" in "hat"). Long vowel sounds can be represented by a vowel followed by a silent "e" (like "a" in "cake") or by a vowel followed by a consonant and a vowel (like "a" in "wait").
Therefore, "clasp" has a long vowel sound, not a short one.