Part of chair -- place covered by planted bottom (5)
I believe the answer is:
splat
'part of chair place' is the definition.
Although both the answer and definition are verbs in their base form, I cannot understand how they can define each other.
'covered by planted bottom' is the wordplay.
'covered by' means one lot of letters goes inside another.
'planted' becomes 'sat' (planted can mean sat in a particular place).
'bottom' becomes 'pl' (I am not sure about this - if you are sure you should believe this answer much more).
'sat' enclosing 'pl' is 'SPLAT'.
Can you help me to learn more?
(Other definitions for splat that I've seen before include "Wet slapping sound" , "Sound of a soft wet landing" , "Sound of a wet and squishy impact" , "Noise of soft wet impact; part of a chair back" , "amusing noise" .)