Crossword Genius

Above all it's meant to keep you warm (8)

Ross

I believe the answer is:

overcoat

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

'meant to keep you warm' is the definition.
I can't tell whether this defines the answer.

'above all' is the wordplay.
'above' becomes 'over' (I've seen this in another clue).
'all' becomes 'coat' (I can't justify this - if you can you should give a lot more credence to this answer).
'over'+'coat'='OVERCOAT'

'it's' is the link.

Can you help me to learn more?

(Other definitions for overcoat that I've seen before include "Protective winter garment" , "Heavy outer garment" , "Evocator (anag.)" , "protective layer" , "Maybe Ulster" .)

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