Heard you had entered crest, in most raw state (7)
I believe the answer is:
crudest
'heard you had entered crest in most raw state' is the definition.
I can't judge whether this defines the answer.
'heard you had entered crest in' is the wordplay.
'heard you' becomes 'u' (commonly used in online communication. I am not sure about the 'heard' bit.).
'had' becomes 'd' (in contractions e.g. 'I'd', 'you'd' etc).
'entered' is an insertion indicator.
'in' means one lot of letters goes inside another.
'd' put within 'crest' is 'crdest'.
'u' placed into 'crdest' is 'CRUDEST'.
Can you help me to learn more?
(Other definitions for crudest that I've seen before include "Most basic" , "Most vulgar" , "extremely raw" .)