Tell about company backing move (8)
I believe the answer is:
relocate
'move' is the definition.
(I know that relocate is a more specific form of move)
'tell about company backing' is the wordplay.
'tell' becomes 'relate' (as in to tell or relate a story).
'about' is an insertion indicator.
'company' becomes 'co' (abbreviation).
'backing' says the letters should be written backwards.
'co' back-to-front is 'oc'.
'relate' placed around 'oc' is 'RELOCATE'.
(Other definitions for relocate that I've seen before include "Move premises" , "Move to another place" , "Move person or thing to a different place" , "Move position" , "move to new area" .)