The price of fish would be more relevant to Shaw in play! (2,4)

I believe the answer is:

so what

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'the price of fish would be more relevant' is the definition.
I can't tell whether this defines the answer.

'to shaw in play' is the wordplay.
'in play' indicates anagramming the letters.
'to'+'shaw'='toshaw'
'toshaw' anagrammed gives 'SO WHAT?'.

Can you help me to learn more?

(Other definitions for so what that I've seen before include "Expresses contempt or lack of interest" , "I'm not interested" , "I don't care" , "It's unimportant, right?" , "I couldn't care less" .)

I've seen this clue in The Telegraph.

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