Crossword Genius

Measure by sexism? An odd activity! (4,4,5)

Ross

I believe the answer is:

body mass index

'measure' is the definition.
(measure of being overweight or underweight)

'by sexism? an odd activity' is the wordplay.
'activity' indicates anagramming the letters (letters become active).
'by'+'sexism'+'an'+'odd'='bysexismanodd'
'bysexismanodd' with letters rearranged gives 'BODY MASS INDEX'.

(Other definitions for body mass index that I've seen before include "rating figure?" , "A measure of fatness" , "Measure of obesity" , "Measure of someone's weight in relation to height" , "Measure of fat/muscle ratio" .)

I've seen this clue in The Guardian.
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