Lengthen, spin out (7)
I believe the answer is:
prolong
I believe this is a double definition.
'lengthen' is the first definition.
(I know that prolong is a more specific form of the action lengthen)
'spin out' is the second definition.
(I've seen this before)
(Other definitions for prolong that I've seen before include "String out" , "Lengthen in duration" , "Extend the duration of" , "Draw out" , "Extend in length" .)