This class is wild (4)

I believe the answer is:

rank

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'this class' is the definition.
(I have seen 'Social class ' mean 'rank' so perhaps 'class' could also mean 'rank')

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for rank that I've seen before include "It could be major row" , "position in forces" , "Status; foul" , "Coarse; tier" , "High social standing" .)

I've seen this clue in The Irish Independent.

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