Bunk with Bill, welcoming quiet place to sleep (8)

'place to sleep' is the definition.
I can't judge whether this defines the answer.

'bunk with bill welcoming quiet' is the wordplay.
'bunk' becomes 'crap' (synonyms).
'with' means one lot of letters go next to another.
'bill' becomes 'ad' (advertisement stuck on wall).
'welcoming' means one lot of letters goes inside another (in sense of 'inviting in').
'quiet' becomes 'sh' ('sh' is used to tell someone to be quiet).
'crap'+'ad'='crapad'
'crapad' enclosing 'sh' is 'CRASHPAD'.

Can you help me to learn more?