Kowtowed (5)
I believe the answer is:
knelt
'kowtowed' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for knelt that I've seen before include "adopted respectful attitude" , "Rest the weight on the knees" , "Genuflected" , "Went down to be knighted?" , "Used hassock maybe" .)