Crossword Genius

Pointer to what the heckler tries to do (6)

Ross

I believe the answer is:

needle

I'm a little stuck... Click here to teach me more about this clue!

'pointer' is the definition.
(as in a needle on a compass)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for needle that I've seen before include "has only one eye" , "Irritate, goad" , "Leaf of a 15 across" , "Unnecessary" , "It's difficult to find one in a haystack" .)

I've seen this clue in The Globe and Mail and The Irish Independent.
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