Crossword Genius

So less casualties? (6)

Ross

I believe the answer is:

losses

I'm a little stuck... Click here to teach me more about this clue!

'casualties?' is the definition.
(I know this)

'so less' is the wordplay.
'so less' anagrams to 'LOSSES'.
But, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for losses that I've seen before include "Amounts by which the costs of a business exceed its revenue" , "They're not profits" .)

I've seen this clue in the Evening Standard.
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