Crossword Genius

Presumed some bounder's too dastardly (10)

Ross

I believe the answer is:

understood

'presumed' is the definition.
(thesaurus)

'some bounder's too dastardly' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'UNDERSTOOD' can be found hidden inside 'bounders too dastardly'.

(Other definitions for understood that I've seen before include "Accepted, implied" , "Taken as 23 [READ]" , "Comprehended" , "Got" .)

I've seen this clue in The Telegraph.
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