Crossword Genius

Idea that ultimately works (5)

Ross

I believe the answer is:

plant

'works' is the definition.
(synonyms)

'idea that ultimately' is the wordplay.
'idea' becomes 'plan' (plan is a kind of idea).
'ultimately' indicates one should take the final letters.
The last letter of 'that' is 't'.
'plan'+'t'='PLANT'

(Other definitions for plant that I've seen before include "Place in the ground to grow" , "Factory; spy" , "Set; factory" , "Factory; organism" , "eg Flower" .)

I've seen this clue in The Daily Express.
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