What does the cryptic crossword clue "Helping stop rail strike? That's foolish (10)" mean?

The definition is "foolish". The wordplay uses an anagram. anagram of RATION (synonym="‘helping’") + IRAL (synonym="IRAL") = IRRATIONAL; definition: "foolish" The answer is IRRATIONAL.

Helping stop rail strike? That's foolish (10)

Guardian Cryptic #28989 | 3 Down | 2023-02-09 flower

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