Crossword Genius

London borough ignoring first indicator (5)

Ross

I believe the answer is:

arrow

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

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

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

Can you help me to learn more?

(Other definitions for arrow that I've seen before include "Fletcher's production" , "Direction pointer" , "Direction indicator" , "What's shot from a bow" , "Missile with a straight thin shaft" .)

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