Seizing all others in flight (8)
I believe the answer is:
wresting
'seizing' is the definition.
(wresting is a kind of seizing)
'all others in flight' is the wordplay.
'all others' becomes 'rest' (as in the rest of a group).
'in' is an insertion indicator.
'flight' becomes 'wing' (wing can mean flight, as in 'on the wing').
'rest' going within 'wing' is 'WRESTING'.
(Other definitions for wresting that I've seen before include "Extracting" , "Strewing (anag.)" .)