Get darker and crude, engaged in row (4,2)
I believe the answer is:
draw in
'get' is the definition.
(I know that draw in has the is a more specific form of the action get)
'crude engaged in row' is the wordplay.
'crude' becomes 'raw' (synonyms).
'engaged in' indicates putting letters inside.
'row' becomes 'din' (both can mean a loud disturbance).
'raw' put within 'din' is 'DRAW IN'.
'darker and' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for draw in that I've seen before include "Of time or daylight, become shorter" , "(Of days) shorten" , "Reduce" .)