Engaging lawyer, go after Trinidad estate for unduly rigorous formality (8)
I believe the answer is:
pedantry
'unduly rigorous formality' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for pedantry that I've seen before include "Den party (anag.)" , "Over-attention to detail" , "Nitpicking" , "Excessive concern with minor rules" , "Fastidiousness" .)