A dangerous pointer? (5)

I believe the answer is:

arrow

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'pointer?' is the definition.
(synonyms)

I don't understand the remainder of the clue.

(Other definitions for arrow that I've seen before include "pointer to the way forward" , "It may indicate" , "one found near Bow?" , "Archer's missile" , "The bowman's missile" .)

I've seen this clue in the Evening Standard.

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