Crossword Genius

Oswald's unlucky formulation (4,3)

Ross

I believe the answer is:

sods law

'unlucky formulation' is the definition.

I don't understand the rest of the clue.

(Other definitions for sods law that I've seen before include "This is bound to happen" , "Expect the worst!" , "this means I'm bound to get some!" , "Why one can't win" , "Pessimistic theory" .)

I've seen this clue in The Guardian.
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