Crossword Genius

Illuminated concerning measure (5)

Ross

I believe the answer is:

litre

'measure' is the definition.
(litre is a kind of measure)

'illuminated concerning' is the wordplay.
'illuminated' becomes 'lit' (synonyms).
'concerning' becomes 're' (both can mean on a particular topic).
'lit'+'re'='LITRE'

(Other definitions for litre that I've seen before include "One thousand cubic centimetres" , "Unit of capacity in metric system" , "Approx 1 point 75 pints" , "less than two pints" , "Metric unit of volume" .)

I've seen this clue in The Mirror.
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