Crossword Genius

Developed for use in a base (9)

Ross

I believe the answer is:

nefarious

'base' is the definition.
(thesaurus)

'developed for use in a' is the wordplay.
'developed' indicates an anagram.
'for'+'use'+'in'+'a'='foruseina'
'foruseina' anagrammed gives 'NEFARIOUS'.

(Other definitions for nefarious that I've seen before include "Very bad" , "immoral?" , "Villainous" , "Extremely wicked" , "Wicked, criminal" .)

I've seen this clue in The Times.
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