Comes in to shift an expert on financial management (9)
I believe the answer is:
economist
'an expert on financial management' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'comes in to shift' is the wordplay.
'shift' indicates anagramming the letters.
'comes'+'in'+'to'='comesinto'
'comesinto' with letters rearranged gives 'ECONOMIST'.
Can you help me to learn more?
(Other definitions for economist that I've seen before include "Expert in all aspects of wealth" , "Financial expert" , "Financial specialist" , "One versed in the management of a country's material resources" , "publication" .)