Listen carefully to sounds of brooks around middle of glen (2,3,4)

I believe the answer is:

be all ears

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'listen' is the definition.
(thesaurus)

'brooks around middle of glen' is the wordplay.
'brooks' becomes 'bears' ('bear' can be a synonym of 'brook').
'around' indicates putting letters inside.
'middle of' says to take the centre.
'glen' becomes 'valley' (I've seen this before).
The centre of 'valley' is 'alle'.
'bears' placed around 'alle' is 'BE ALL EARS'.

'carefully to sounds of' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for be all ears that I've seen before include "Attend exclusively" , "Listen intently" .)

I've seen this clue in The Times.

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