Crossword Genius

Special knowledge of a sound law (4)

Ross

I believe the answer is:

lore

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'special knowledge' is the definition.
'lore' can be an answer for 'knowledge' (lore is a kind of knowledge). I am not certain of the 'special' bit.

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

Can you help me to learn more?

(Other definitions for lore that I've seen before include "Old learning" , "Role for learning" , "Wisdom" , "Ancient learning" , "Role for body of traditions" .)

I've seen this clue in the Evening Standard.
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