Crossword Genius

Tart's mega upset by plan (9)

Ross

I think it could be either:

stratagem

strategem

'plan' is the definition.
(stratagem is a kind of plan)

'tart's mega upset' is the wordplay.
'upset' is an anagram indicator.
'tarts'+'mega'='tartsmega'
'tartsmega' with letters rearranged gives 'STRATAGEM'.

'by' is the link.

(Other definitions for stratagem that I've seen before include "could be a trick" , "Clever scheme" , "Scheme to outwit an opponent" , "Device" , "A cunning plan or scheme" .)

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