Crossword Genius

Macho guards fighting source of cyber invasion? (7)

Ross

I believe the answer is:

malware

'source of cyber invasion?' is the definition.
(malware is malicious software)

'macho guards fighting' is the wordplay.
'macho' becomes 'male' (I've seen this in another clue).
'guards' is an insertion indicator (inserted letters are guarded).
'fighting' becomes 'war'.
'male' enclosing 'war' is 'MALWARE'.

(Another definition for malware that I've seen is " Pernicious computer programs".)

I've seen this clue in The Telegraph.
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