Fatigue (9)
'fatigue' is the definition.
(feeling fatigued or weary)
This is all the clue.
(Other definitions for weariness that I've seen before include "Tired feeling" , "Fatigue, tiredness" , "State of fatigue or utter boredom" , "Lassitude" , "Lack of energy" .)
(Other definitions for tiredness that I've seen before include "Weary feeling" , "Lassitude; residents (anag.)" , "7 (anag)" , "Residents in state of fatigue" , "Weariness" .)
'fatigue' is the definition.
(I know that fatigue can be written as tire)
This is all the clue.
(Other definitions for tire that I've seen before include "Grow weary of rite" , "one of four found on Chevrolet?" , "Flag" , "Become exhausted" , "Become fatigued" .)