More lethal (8)
I believe the answer is:
deadlier
'more lethal' is the definition.
('deadly' can be a synonym of 'lethal')
This is all the clue.
(Other definitions for deadlier that I've seen before include "more like the female, it's said" , "More lethal or fatal" .)
I've seen this clue in The Sunday Times and the King Feature Syndicate.
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