Crossword Genius

Gathered concerning length (5)

Ross

I believe the answer is:

metre

'length' is the definition.
(I've seen this before)

'gathered concerning' is the wordplay.
'gathered' becomes 'met' ('meet' can be a synonym of 'gather').
'concerning' becomes 're' (both can mean on a particular topic).
'met'+'re'='METRE'

(Other definitions for metre that I've seen before include "Approx. thirty nine point three seven inches" , "Distance" , "Moisture remover" , "Poetic rhythm" , "Approximately 39 inches" .)

I've seen this clue in The Mirror.
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