Crap coke and drop of acid upset one doing lines (5)
I believe the answer is:
actor
'one doing lines' is the definition.
'actor' can be an answer for 'lines' (thesaurus). I am not certain of the 'one doing' bit.
'crap coke and drop of acid upset' is the wordplay.
'crap' becomes 'rot' (synonyms).
'coke' becomes 'C' (synonyms).
'and' means one lot of letters go next to another.
'drop of acid' becomes 'a' (I can't justify this - if you can you should believe this answer much more).
'upset' says the letters should be written in reverse.
'rot'+'c'+'a'='rotca'
'rotca' written backwards gives 'ACTOR'.
Can you help me to learn more?
(Other definitions for actor that I've seen before include "One in a play" , "Dramatic artist" , "One taking part" , "eg Anthony Hopkins" , "Theatrical performer" .)