Crossword Genius

Please stop Pelham obstructing rule of law (8)

Ross

I believe the answer is:

estoppel

I'm a little stuck... Click here to teach me more about this clue!

'rule of law' is the definition.
'estoppel' can be an answer for 'rule' (estoppel is a kind of rule). I'm not sure about the 'of law' bit.

'please stop pelham obstructing' is the wordplay.
'ESTOPPEL' is hidden in amongst the letters.
However, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for estoppel that I've seen before include "Legal principle" , "bar" , "Conclusive admission" .)

I've seen this clue in The Telegraph.
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