Crossword Genius

This will shed light on gang engaged in crime (5-2)

Ross

I believe the answer is:

screw-in

'this will shed light' is the definition.
(type of lightbulb)

'gang engaged in crime' is the wordplay.
'gang' becomes 'crew' (synonyms).
'engaged in' means one lot of letters goes inside another.
'crime' becomes 'sin'.
'crew' placed within 'sin' is 'SCREW-IN'.

'on' acts as a link.

I've seen this clue in The Guardian.
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