1 across
Advantage
of
computerised
identikit
picture
when
pursuing
crook
virtually
(7)
Advantage of computerised identikit picture when pursuing crook virtually (7)
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The definition is at the beginning of the clue.
How the clue works
Right, so Advantage is the definition here, that's your benefit. For the wordplay, take BENT meaning crook, and "virtually" tells you to lop off the last letter, leaving BEN - then stick EFIT after it, that's an E-FIT, the computerised identikit picture the clue's on about - and BEN plus EFIT gives you the answer.