Invention of a rich blind eccentric (10)
I believe the answer is:
brainchild
'invention' is the definition.
(I've seen this before)
'a rich blind eccentric' is the wordplay.
'eccentric' indicates an anagram.
'a'+'rich'+'blind'='arichblind'
'arichblind' anagrammed gives 'BRAINCHILD'.
'of' is the link.
(Other definitions for brainchild that I've seen before include "One's original idea" , "Bright idea" , "wheeze" , "Invention" , "Original idea or work" .)