Cryptic crossword clue
Permission to leave last of the porridge 6

The most common and most likely answer to this crossword clue is the 6 letter word CONGEE

I've seen this crossword clue in The Guardian
C
O
N
G
E
E

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The straight part
We know that "porridge" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case porridge = congee.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does CONGEE mean?

CONGEE noun
  1. Leave, formal permission for some action, :
  2. Formal dismissal; any dismissal; (originally & particularly humorously ironic) abrupt dismissal without ceremony.
  3. Formal leavetaking; any farewell.
  4. A fee paid to make another go away, alms to a persistent beggar.
  5. A bow, curtsey, or other gesture made at departure but (later) including at greeting or in obeissance or respect.
CONGEE verb
  1. To give congee, (particularly)
  2. To take congee: to leave ceremoniously.
  3. To make a congee: to bow, curtsey, etc., (particularly dialectal) while leaving; to make obeissance, show respect, or defer to someone or something.
CONGEE noun
  1. A type of thick rice porridge or soup, sometimes prepared with vegetables and/or meat.

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