Crossword Genius

Virtue-signaller supported by low-down element (7)

Ross

I believe the answer is:

halogen

'element' is the definition.
(halogen is a kind of element)

'virtue-signaller supported by low-down' is the wordplay.
'virtue-signaller' becomes 'halo' (worn by saints, angels etc).
'supported by' says to put letters next to each other (in a down clue, some letters hold up others).
'low down' becomes 'gen' (both can mean information).
'halo'+'gen'='HALOGEN'

(Other definitions for halogen that I've seen before include "Eg, fluorine or chlorine" , "iodine, perhaps" , "One of group of five elements (used in this type of lamp)" , "Element such as iodine" , "reactive group member" .)

I've seen this clue in The Times.
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