Jumper's attachment stuck around back of wardrobe — gosh! (6,4)

'jumper's attachment' is the definition.
(cord attached to someone doing a bungee jump)

'stuck around back of wardrobe gosh' is the wordplay.
'stuck' becomes 'bunged' (to stick something somewhere is to bung it there).
'around' means one lot of letters goes inside another.
'back of wardrobe' becomes 'e' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'gosh' becomes 'cor' (I've seen this before).
'e'+'cor'='ecor'
'bunged' placed around 'ecor' is 'BUNGEE CORD'.

Can you help me to learn more?