Namely, miner essentially foolish (7)

I believe the answer is:

asinine

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'foolish' is the definition.
(similar in meaning)

'namely miner essentially' is the wordplay.
'namely' becomes 'asin' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'essentially' means to look at the middle letters.
The middle letters of 'miner' are 'ine'.
'asin'+'ine'='ASININE'

Can you help me to learn more?

(Other definitions for asinine that I've seen before include "Foolish like donkey" , "Foolish, silly" , "Extremely stupid or foolish" , "Daft" , "Jenny's often like this" .)

I've seen this clue in The Daily Express.

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