So placed as to sit on the end of the bed (5)
I believe the answer is:
sited
'so placed' is the definition.
'sited' can be an answer for 'placed' (I've seen this in another clue). I'm not sure about the 'so' bit.
'to sit on the end of the bed' is the wordplay.
'to sit' becomes 'site' (I can't explain this - if you can you should believe this answer much more).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'the end of' indicates one should take the final letters.
The last letter of 'bed' is 'd'.
'site'+'d'='SITED'
'as' acts as a link.
Can you help me to learn more?
(Other definitions for sited that I've seen before include "Put" , "installed" , "Situated" , "Positioned" , "Placed, located" .)