Crossword Genius

An indicator of overall anxiety endlessly alarming from the start (5)

Ross

I believe the answer is:

arrow

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'an indicator' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

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(Other definitions for arrow that I've seen before include "production of Fletcher?" , "Move quickly" , "broadly distinguishing old convict" , "Cupid's projectile" , "Missile for bowman" .)

I've seen this clue in The Irish Times.
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