Crossword Genius

Difficult experimentation (7)

Ross

I believe the answer is:

testing

I believe this is a double definition.

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

'experimentation' is the second definition.
(I know that testing is a type of experimentation)

(Other definitions for testing that I've seen before include "of a difficult nature" , "stressful" , "tiresome" , "Examining" , "Trying out" .)

I've seen this clue in The Daily Express.
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