Crowded out and died without scalp treatment (9)
I believe the answer is:
displaced
'crowded out' is the definition.
'displaced' can be an answer for 'out' (thesaurus). I am not sure about the 'crowded' bit.
'died without scalp treatment' is the wordplay.
'without' means one lot of letters goes inside another ('without' can be similar in meaning to 'outside').
'treatment' indicates anagramming the letters (the letters must be processed or treated).
'scalp' is an anagram of 'splac'.
'died' placed around 'splac' is 'DISPLACED'.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for displaced that I've seen before include "Supplanted" , "Moved from its proper position" , "Forced to leave home" .)