To put it in a nutshell, study, stupid! (8)

I believe the answer is:

condense

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'to put it in a nutshell' is the definition.
I can't tell whether this definition defines the answer.

'study stupid' is the wordplay.
'study' becomes 'con' (con can mean to study).
'stupid' becomes 'dense' (similar in meaning).
'con'+'dense'='CONDENSE'

Can you help me to learn more?

(Other definitions for condense that I've seen before include "Reduce volume" , "Abbreviate" , "precis" , "Turn from gas to liquid" , "Make more concise" .)

I've seen this clue in the Evening Standard.

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