Tried to exercise when fatigued (5)
I believe the answer is:
tired
'fatigued' is the definition.
('tire' can be a synonym of 'fatigue')
'tried to exercise' is the wordplay.
'tried' can be anagrammed to 'TIRED'.
But, I'm not clear how the anagram is indicated.
'when' is the link.
Can you help me to learn more?
(Other definitions for tired that I've seen before include "Are American cars so" , "Worn-out" , "Depleted of energy" , "Beat" , "Weary, jaded" .)