Paradigm shift in poem: it has terminal consonance (7)
I believe the answer is:
epitome
'paradigm' is the definition.
('epitome' can be a synonym of 'paradigm')
'shift in poem it has terminal consonance' is the wordplay.
'shift in' indicates anagramming the letters.
'has' says to put letters next to each other.
'terminal' indicates one should take the final letters (terminal refers to the end).
The last letter of 'consonance' is 'e'.
'poem'+'it'='poemit'
'poemit' anagrammed gives 'epitom'.
'epitom'+'e'='EPITOME'
(Other definitions for epitome that I've seen before include "Exemplar - embodiment" , "Typical example, prototype" , "Model" , "Something embodying perfectly a stated quality or idea" , "ie Tempo (anag.)" .)