London borough ignoring first indicator (5)
I believe the answer is:
arrow
'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" .)