Plopped into a chair (3)
I believe the answer is:
sat
'plopped into a chair' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sat that I've seen before include "Used a chair" , "Rested" , "Was sitting" , "Took (an exam)" , "Pulled up a 29 down" .)