Rested on the bottom (3)
I believe the answer is:
sat
'rested' is the definition.
(to sit is to rest)
'on the bottom' is the wordplay.
'on' is a charade indicator (letters next to each other).
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'bottom' becomes 'sa' (I can't justify this - if you can you should believe this answer much more).
't' after 'sa' is 'SAT'.
Can you help me to learn more?
(Other definitions for sat that I've seen before include "Took a chair" , "Was in session" , "Pulled up a 29 down" , "Was sitting" , "twenty-four hours" .)