What does the cryptic crossword clue "Error in emergency call, a firefighter sent the wrong way (7)" mean?

The definition is "Error". The wordplay uses a hidden word. hidden “in” and reversed/”sent the wrong way”: emergenc-Y CALL A F-irefighter The answer is FALLACY.

Error in emergency call, a firefighter sent the wrong way (7)

Guardian Cryptic #28918 | 25 Across | 2022-11-18 flower

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Error in emergency call, a fire­fighter sent the wrong way (7)

Error in emergency call, a firefighter sent the wrong way (7)