Take some exercise, fool! (4)

I believe the answer is:

dope

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'fool' is the definition.
(thesaurus)

'take some exercise' is the wordplay.
'take' becomes 'dop' (I can't explain this - if you can you should give a lot more credence to this answer).
'some' suggests taking the first letters.
The first letter of 'exercise' is 'e'.
'dop'+'e'='DOPE'

Can you help me to learn more?

(Other definitions for dope that I've seen before include "Simpleton" , "Information; nitwit" , "Silly type" , "Information, fool" , "Lowdown; drugs (informal)" .)

I've seen this clue in The Independent.

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