Attend bash (4)
I believe the answer is:
beat
This clue might be a double definition.
'attend' is the first definition.
The answer and definition can be both to do with perception as well as being verbs in their base form.
Maybe there's an association between them I don't understand?
'bash' is the second definition.
(thesaurus)
(Other definitions for beat that I've seen before include "Defeat; pulsate" , "Baffle - all in" , "course for law enforcement officers" , "Strike; rhythm" , "Policeman's regular route" .)