Lay hold of (5)
(Other definitions for seize that I've seen before include "appropriate" , "Take (an opportunity)" , "Confiscate" , "Take forcibly" , "Become jammed" .)
'lay hold of' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for take that I've seen before include "Remove; capture" , "Convey; consume" , "Endure; single recording" , "Subtract; accept" , "Procure" .)