Crossword Genius

Describing the main area on ice, possibly - cold (7)

Ross

I believe the answer is:

oceanic

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'describing the main' is the definition.
The definition suggests a singular noun which matches the answer.

'area on ice possibly cold' is the wordplay.
'area' becomes 'a' (maths abbreviation).
'possibly' indicates an anagram.
'cold' becomes 'C' (eg on taps).
'a'+'on'+'ice'='aonice'
'aonice' with letters rearranged gives 'oceani'.
'oceani'+'c'='OCEANIC'

Can you help me to learn more?

(Other definitions for oceanic that I've seen before include "description of rollers" , "Relating to the open seas" , "Pelagic" , "Huge" , "Like the main" .)

I've seen this clue in The Independent.
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