With soft extra cushions (6)
I believe the answer is:
padded
'cushions' is the definition.
Although both the answer and definition are verbs, they are not in the same form of the verb.
'with soft extra' is the wordplay.
'with' says to put letters next to each other.
'soft' becomes 'p' (musical abbreviation for piano, 'soft').
'extra' becomes 'added' (something added is extra).
'p' put next to 'added' is 'PADDED'.
Can you help me to learn more?
(Other definitions for padded that I've seen before include "trudged off" , "Walked on foot; stuffed" , "Kind of soft cell for violent prisoner" , "Cushioned; moved silently" , "Stuffed with soft material" .)