Immerse oneself in article by graduate (5)
I believe the answer is:
bathe
'immerse oneself' is the definition.
'article by graduate' is the wordplay.
'article' becomes 'the' (the 'definite article' part of speech).
'by' says to put letters next to each other.
'graduate' becomes 'ba'.
'the' put after 'ba' is 'BATHE'.
'in' is the link.
(Other definitions for bathe that I've seen before include "Take a swim; envelop" , "go into rollers?" , "Swim for pleasure, and clean oneself" , "Swim or paddle" , "spend time in the water" .)