Researcher requiring support over in Washington (7)
I believe the answer is:
postdoc
'researcher' is the definition.
(someone doing postdoctoral research)
'requiring support over in washington' is the wordplay.
'requiring support' becomes 'post' (I can't justify this - if you can you should give a lot more credence to this answer).
'over' becomes 'o' (cricket abbreviation).
'in' is an insertion indicator.
'washington' becomes 'dc' (Washington DC).
'o' inserted into 'dc' is 'doc'.
'post'+'doc'='POSTDOC'
Can you help me to learn more?
(Other definitions for postdoc that I've seen before include "Researcher" , "Someone doing advanced research" .)