Crossword Genius

Reduction, as included in order (8)

Ross

I believe the answer is:

decrease

'reduction' is the definition.
('decrease' can be a synonym of 'reduction')

'as included in order' is the wordplay.
'included in' means one lot of letters goes inside another.
'order' becomes 'decree' ('decree' can be a synonym of 'order').
'as' inserted into 'decree' is 'DECREASE'.

(Other definitions for decrease that I've seen before include "Dock" , "Plummet" , "Turn down" , "Grow smaller or less" , "subsidence" .)

I've seen this clue in The Telegraph.
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