Court grade adjusted with ripples (10)

I believe the answer is:

corrugated

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'court grade adjusted with ripples' is the definition.
I can't tell whether this defines the answer.

'court grade adjusted' is the wordplay.
'adjusted' is an anagram indicator.
'court'+'grade'='courtgrade'
'courtgrade' anagrammed gives 'CORRUGATED'.

Can you help me to learn more?

(Other definitions for corrugated that I've seen before include "groovy!" , "wrinkled" .)

I've seen this clue in the Sydney Morning Herald.

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