What is the answer to the NYT Crossword clue "Immune system agent" from October 18, 2026?

Crossword clue

“Immune system agent”

This clue appeared as 13-Down in the NYT Crossword on Sunday, October 18, 2026. The answer has 5 letters.

Answer · 5 lettersFirst appearance

TCELL

Letters5

Starts withT

Ends withL

Vowels1

Where this clue has appeared

NYT Crossword
Oct 18, 20265 letters→

About this clue

The clue “Immune system agent” ran in the NYT Crossword on October 18, 2026 as 13-Down. Its answer is a 5-letter word that starts with T and ends with L, with only 1 vowel, so think abbreviations or consonant clusters.

See every answer from the puzzle on the NYT Crossword page for October 18, 2026, or learn how clues like this work in our guide to crossword clue types.

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FAQ

What is the answer to the “Immune system agent” clue?+

The answer is TCELL (5 letters), from the NYT Crossword of October 18, 2026.

Where has this clue appeared?+

We have seen it 1 time in the NYT Crossword.

How do I find other NYT Crossword answers?+

Open the full list of answers for October 18, 2026, or browse every date on the NYT Crossword hub.