The most common and most likely answer to this crossword clue is the 5 plus 3 letter word SOD’S LAW
I've seen this crossword clue in The Guardian
S
O
D
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€
™
S
L
A
W
More clues leading to the result SOD’S LAW
- So Dad’s starter comes on a salad? Something bad will inevitably occur
- To hell with cabbage salad! Pessimists believe it
- I’ve had enough of salad – but this means I’m bound to get some!
- Oswald’s unlucky formulation
- Maxim‘s grass salad
- Pessimistic canon‘s portion of ground cabbage salad
- Oswald’s assassinated — if it can go wrong it will?
- This is bound to happen, therefore lads alter wicket
- Why things go wrong in ground cabbage dish
Buddy explains!

The straight part
We know that "Maxim/Maxim" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case maxim/maxim = sod’s law.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.