Clue: Green card, informally

Answer: AMEX

Length: 4

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Similar Clues:

• Green-card holders (ALIENS with 6 letters)
• Subj. for some green card holders (ESL with 3 letters)
• U.S. green card distributor (INS with 3 letters)
• Green card, for short (AMEX with 4 letters)
• MacDowell of "Green Card" (ANDIE with 5 letters)
• Green card issuer, for short (AMEX with 4 letters)
• Ones with green cards (ALIENS with 6 letters)
• Green card holder's class, perhaps: Abbr. (ESL with 3 letters)
• Green-card agcy. (INS with 3 letters)
• Green card issuer (AMERICANEXPRESS with 15 letters)