Investigated no amateurish plot (6)

I believe the answer is:

probed

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'investigated' is the definition.
(probing is a kind of investigating)

'no amateurish plot' is the wordplay.
'no amateurish' becomes 'pro' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'plot' becomes 'bed' (a plot of land).
'pro'+'bed'='PROBED'

Can you help me to learn more?

(Other definitions for probed that I've seen before include "Physically examined" , "Investigated closely as dentist does a tooth" , "Examined, dug into" , "Questioned or examined thoroughly and closely" , "Searched" .)

I've seen this clue in the Evening Standard.

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