Clue: Org. headquartered on Constitution Ave.

Answer: IRS

Length: 3

---

Similar Clues:

• Spontaneous assembly often organized online (FLASHMOB with 8 letters)
• Avenge oneself on (GET with 3 letters)
• ___ aves (oners) (RARAE with 5 letters)
• Avenge oneself (GETEVEN with 7 letters)
• Org. headquartered on N.Y.C.'s First Avenue (THEUN with 5 letters)
• Its HQ is on Washington's Constitution Avenue (IRS with 3 letters)
• Onetime capital of India (e.g. AGRA with 4 letters)
• Oneida Co. city (UTICA with 5 letters)
• N.Y.C.'s Third and Ninth Avenue lines, e.g. (ELS with 3 letters)
• Organs' kin (PIANOS with 6 letters)