Study article carried by Communist (4)
I believe the answer is:
read
'study' is the definition.
(I know that study can be written as read)
'article carried by communist' is the wordplay.
'article' becomes 'a' (the indefinite article in English).
'carried by' means one lot of letters goes inside another.
'communist' becomes 'red' (red can informally mean communist).
'a' put within 'red' is 'READ'.
(Other definitions for read that I've seen before include "Measure energy or fuel consumption" , "Interpret printed matter" , "(Of passage) have a certain wording" , "Study (for a degree?)" , "Run one's eye over" .)