Herbert Lom, endlessly in court (4)
I believe the answer is:
clot
'herbert' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see an association between them that I don't see?
'lom endlessly in court' is the wordplay.
'endlessly' means to remove the last letter.
'in' means one lot of letters goes inside another.
'court' becomes 'ct'.
'lom' with its last letter removed is 'lo'.
'lo' put into 'ct' is 'CLOT'.
Can you help me to learn more?
(Other definitions for clot that I've seen before include "Thrombus - fool" , "3 [DUMMY]" , "Idiot - liquid turned to a solid state" , "Curdle - idiot" , "Clumsy person" .)