Crossword Genius

Crossing indicator in Emerald Isle? (5,3)

Ross

I believe the answer is:

green man

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'crossing indicator' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'emerald isle?' is the wordplay.
'emerald' becomes 'green' (I can't explain this - if you can you should believe this answer much more).
'isle?' becomes 'man' (the Isle of Man is an example).
'green'+'man'='GREEN MAN'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for green man that I've seen before include "The sign of the cross" , "fertility symbol?" , "Pedestrian crossing indicator" , "Mythical nature hero - pedestrians may cross with him!" .)

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