Above all theyre meant to keep you warm (9)

I believe the answer is:

overcoats

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

'above all' is the wordplay.
'above' becomes 'over' (I've seen this before).
'all' becomes 'coats' (I can't justify this - if you can you should give a lot more credence to this answer).
'over'+'coats'='OVERCOATS'

Can you help me to learn more?

(Another definition for overcoats that I've seen is " things to wear".)

I've seen this clue in The Irish News.

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