Each source of riches gets attention (3)
I believe the answer is:
ear
'attention' is the definition.
(ear is a kind of attention)
'each source of riches' is the wordplay.
'each' becomes 'ea'.
'source of' indicates taking the first letters.
The initial letter of 'riches' is 'r'.
'ea'+'r'='EAR'
'gets' is the link.
(Other definitions for ear that I've seen before include "Part of cereal plant containing seed" , "Organ involved with balance" , "See 24" , "Seed-bearing part of corn" , "Head of grain" .)