Exhausting (6)
'exhausting' is the definition.
(I know that exhausting can be written as tiring)
This is the entire clue.
(Other definitions for tiring that I've seen before include "Growing weary or bored" , "Wearisome" , "Causing weariness" , "Exhausting or tedious" , "Wearying, exhausting" .)
'exhausting' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for using that I've seen before include "Exploiting for one's own advantage" , "Putting to a particular purpose" , "having recourse to" , "addiction" , "Employing" .)