Putting together new dissertation after second year (9)
I believe the answer is:
synthesis
'putting together' is the definition.
(thesaurus)
'new dissertation after second year' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'dissertation' becomes 'thesis' (synonyms).
'after' says to put letters next to each other.
'second' becomes 's' (common abbreviation).
'year' becomes 'y'.
'n'+'thesis'='nthesis'
's'+'y'='sy'
'nthesis' put after 'sy' is 'SYNTHESIS'.
(Other definitions for synthesis that I've seen before include "Combination of components to form a whole" , "Process of bringing together to form a whole" , "In shy sets (anag.)" , "The making of compounds from simpler ones" , "Fusion" .)