European pays to listen to solicitor brood (3,4,5,3)
I believe the answer is:
eat ones heart out
'brood' is the definition.
(both can mean to pine for a lover)
'european pays to listen to solicitor' is the wordplay.
'european' becomes 'e' (abbreviation e.g. EU).
'pays' becomes 'atones' (as in to pay someone back).
'to listen to' becomes 'hear' (I've seen this before).
'solicitor' becomes 'tout' (someone who solicits business).
'e'+'atones'+'hear'+'tout'='EAT ONES HEART OUT'
(Other definitions for eat ones heart out that I've seen before include "Suffer from excessive longing" , "pine" , "Suffer through brooding over misfortune" , "long" , "brood over misfortune" .)