Clue: Blood drive spec.

Answer: APOS

Length: 4

---

Similar Clues:

• Supporting a blood drive, say (DONATING with 8 letters)
• Blood-drive volunteer (DONOR with 5 letters)
• Blood-drive participant (DONOR with 5 letters)
• Driver of the Cannonball Special (KJONES with 6 letters)
• Drive-thru specification (SIZE with 4 letters)
• Blood drive donation (PINT with 4 letters)
• Blood drive contributor (DONOR with 5 letters)
• Blood drive attendee (DONOR with 5 letters)
• Blood drive letters (ABO with 3 letters)
• Blood specification (ONEUNIT with 7 letters)