Mock Tudor front associated with relative (5)
I believe the answer is:
taunt
'mock' is the definition.
(I know that taunt is a type of mock)
'tudor front associated with relative' is the wordplay.
'front' suggests taking the first letters.
'associated with' means one lot of letters go next to another.
'relative' becomes 'aunt' (aunt is a kind of relative).
The initial letter of 'tudor' is 't'.
't'+'aunt'='TAUNT'
(Other definitions for taunt that I've seen before include "Mock, jeer" , "Wounding jibe" , "Goad, provoke" , "Guy" , "Gibe" .)