What does the cryptic crossword clue "Woody surrounding for work unit that produces a reaction? (8)" mean?

The definition is "reaction?". The wordplay uses a container (one word inside another). ERG (synonym="work unit") in ALLEN (synonym="Woody") = ALLERGEN; definition: "that produces a reaction?" The answer is ALLERGEN.

Woody surrounding for work unit that produces a reaction? (8)

Guardian Cryptic #29085 | 16 Down | 2023-06-01 flower

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