Peg finally ready for couch (6)
I believe the answer is:
settee
'couch' is the definition.
(settee is a kind of couch)
'peg finally ready' is the wordplay.
'peg' becomes 'tee' (tee is a kind of peg).
'finally' means one lot of letters go next to another (some letters go at the end of others).
'ready' becomes 'set' (set can mean ready or prepared).
'tee' after 'set' is 'SETTEE'.
'for' acts as a link.
(Other definitions for settee that I've seen before include "two-seater?" , "Multiple seat" , "A long couch without arm-rests" , "Long seat with back and arms" , "Intended recipient of my work, so to speak" .)