Intense effort (6)
I believe the answer is:
strain
(Other definitions for strain that I've seen before include "variety" , "Twist" , "Remove by passing through a filter" , "Family; effort" , "Exert oneself to the utmost" .)
I believe the answer is:
strain
(Other definitions for strain that I've seen before include "variety" , "Twist" , "Remove by passing through a filter" , "Family; effort" , "Exert oneself to the utmost" .)