Carve note inside emergency room with piece of wood (8)
I believe the answer is:
splinter
'piece of wood' is the definition.
'splinter' can be an answer for 'piece' (thesaurus). I also know that 'wood' relates to this answer.
'carve note inside emergency room' is the wordplay.
'carve' becomes 'split' (I can't explain this - if you can you should believe this answer much more).
'note' becomes 'n' (abbreviation).
'inside' means one lot of letters goes inside another.
'emergency room' becomes 'ER' (abbreviation popularized by US TV series).
'split' enclosing 'n' is 'splint'.
'splint'+'er'='SPLINTER'
'with' acts as a link.
Can you help me to learn more?
(Other definitions for splinter that I've seen before include "Small thin sharp bit of wood, glass or metal" , "Needle-like piece of wood" , "Shiver; break" , "Break into fragments, shatter" , "Element in diamond" .)