Plant inside has me up on couch (5)
I believe the answer is:
embed
'plant inside' is the definition.
'embed' can be an answer for 'plant' (synonyms). I am not sure about the 'inside' bit.
'me up on couch' is the wordplay.
'up' is a reversal indicator (in down clue: letters go upwards).
'on' is a charade indicator (letters next to each other).
'couch' becomes 'bed' (I've seen this before).
'me' backwards is 'em'.
'em'+'bed'='EMBED'
'has' acts as a link.
Can you help me to learn more?
(Other definitions for embed that I've seen before include "Plant deeply" , "Fix in the mind" , "Fix fast in something solid" , "Put entirely inside something else" , "Fix securely" .)