Flipping firm behind's covered seat (6)
I believe the answer is:
locate
'seat' is the definition.
(both can mean to place or position something)
'flipping firm behind's covered' is the wordplay.
'flipping' says the letters should be written in reverse.
'firm' becomes 'co' (a firm is a company).
'behind' becomes 'late' ().
'covered' means one lot of letters goes inside another.
'co' back-to-front is 'oc'.
'oc' inserted inside 'late' is 'LOCATE'.
(Other definitions for locate that I've seen before include "Discover the place where something is" , "Discover place where thing is" , "Find or situate" , "spot" , "Discover the position of something" .)