Article sent up by Robert - a rich man (5)
I believe the answer is:
nabob
'a rich man' is the definition.
(I know that nabob is a type of man of means)
'article sent up by robert' is the wordplay.
'article' becomes 'an' (English indefinite article).
'sent up' shows that the letters should be reversed in order.
'by' says to put letters next to each other.
'robert' becomes 'bob' (short for Robert).
'an' backwards is 'na'.
'na'+'bob'='NABOB'
(Other definitions for nabob that I've seen before include "Wealthy influential person" , "Magnate; formerly one with Eastern wealth" , "Rich British merchant in India" , "Nawab" , "Mogul governor; very rich or important person" .)