Astonishing attention shown by Bishop Wareing, ultimately leering at nurses (4-8)

I believe the answer is:

mind-boggling

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'astonishing attention' is the definition.
'mind-boggling' can be an answer for 'astonishing' (I've seen this before). I am not sure about the 'attention' bit.

'by bishop wareing ultimately leering at nurses' is the wordplay.
'by' becomes 'mind' (I can't explain this - if you can you should give a lot more credence to this answer).
'bishop' becomes 'B' (chess abbreviation).
'ultimately' says to take the final letters.
'leering at' becomes 'ogling' (I've seen this in another clue).
'nurses' is an insertion indicator (nurse can mean to hold onto or harbour).
The final letter of 'wareing' is 'g'.
'g' put within 'ogling' is 'oggling'.
'mind'+'b'+'oggling'='MIND-BOGGLING'

'shown' acts as a link.

Can you help me to learn more?

(Other definitions for mind-boggling that I've seen before include "Incredible" , "Beyond comprehension" , "Almost impossible to comprehend" , "Astonishing" , "Overwhelming" .)

I've seen this clue in The Times.

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