Fake groom died, having introduced tango (7)
I believe the answer is:
pretend
'fake' is the definition.
(thesaurus)
'groom died having introduced tango' is the wordplay.
'groom' becomes 'preen' (I've seen this before**).
'died' becomes 'd'.
'having' indicates putting letters inside.
'introduced' suggests taking the first letters.
The initial letter of 'tango' is 't'.
'preen'+'d'='preend'
'preend' going around 't' is 'PRETEND'.
(Other definitions for pretend that I've seen before include "Behave unnaturally" , "Dissemble" , "make a false claim" , "Imaginary, make-believe" , "keep up appearances" .)