Official look at investing money after downward trend (8)
I believe the answer is:
diplomat
'official' is the definition.
(I know that diplomat is a type of senior government officials)
'look at investing money after downward trend' is the wordplay.
'look' becomes 'lo' ('lo' is an archaic exclamation meaning 'look!').
'investing' means one lot of letters goes inside another (inserted letters are taken in or invested).
'money' becomes 'm' (abbreviation in economics).
'after' says to put letters next to each other.
'downward trend' becomes 'dip' (dip can mean a downward movement).
'lo'+'at'='loat'
'loat' going around 'm' is 'lomat'.
'lomat' after 'dip' is 'DIPLOMAT'.
(Other definitions for diplomat that I've seen before include "One who represents his govermnent abroad" , "Ambassador, for example" , "Overseas representative" , "envoy, say" , "Tactful government official" .)