Attend, being exhausted (4)
I believe the answer is:
beat
I believe this is a double definition.
'attend' is the first definition.
(I've seen this in other clues)
'being exhausted' is the second definition.
(thesaurus)
(Other definitions for beat that I've seen before include "patrol route?" , "Flog" , "Strike repeatedly" , "Defeat; rhythm" , "Conquer" .)