Mobile's location in a research room starts to aid medical activities (7)
I believe the answer is:
alabama
'mobile's location' is the definition.
'Alabama' can be an answer for 'location' (Alabama is an example). I am not sure about the 'mobile's' bit.
'a research room starts to aid medical activities' is the wordplay.
'research room' becomes 'lab' (I can't justify this - if you can you should believe this answer much more).
'starts to' suggests taking the first letters.
The first letters of 'aid medical activities' is 'ama'.
'a'+'lab'+'ama'='ALABAMA'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for alabama that I've seen before include "US state west of Georgia" , "State of SE USA" , "Source of cotton" , "US state in the cotton belt" , "17th US state, joined 1819" .)