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.
'ready' becomes 'set' ('set' can be similar in meaning to 'ready').
'tee' after 'set' is 'SETTEE'.
'for' is the 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" .)