Crossword Genius

Unpleasantness for SAS sent in mistakenly (9)

Ross

I believe the answer is:

nastiness

'unpleasantness' is the definition.
(I know that nastiness is a type of unpleasantness)

'sas sent in mistakenly' is the wordplay.
'mistakenly' indicates anagramming the letters.
'sas'+'sent'+'in'='sassentin'
'sassentin' is an anagram of 'NASTINESS'.

'for' acts as a link.

(Other definitions for nastiness that I've seen before include "hostility" , "Malevolence" , "Pollution" , "Unpleasant behaviour" , "Repugnant behaviour" .)

I've seen this clue in The Daily Express.
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