Completely changed form of ID for emigrants (14)
I believe the answer is:
transmogrified
'completely changed' is the definition.
(I've seen this before)
'form of id for emigrants' is the wordplay.
'form of' indicates anagramming the letters (the letters need to be in another 'form').
'id'+'for'+'emigrants'='idforemigrants'
'idforemigrants' with letters rearranged gives 'TRANSMOGRIFIED'.
(Other definitions for transmogrified that I've seen before include "completely changed" , "Altered" .)