Constrict, squeeze (7)
I believe the answer is:
tighten
This clue is a double definition.
'constrict' is the first definition.
(I know that constrict is a more specific form of the action the tighten)
'squeeze' is the second definition.
(tighten can mean to squeeze or contract)
(Other definitions for tighten that I've seen before include "increase tension" , "Give an extra turn" , "becoming tense" , "Restrict" , "Stiffen" .)