The most common and most likely answer to this crossword clue is the 12 letter word DISPENSATION
I've seen this crossword clue in The Daily Telegraph
D
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More clues leading to the result DISPENSATION
- Pianist done playing without soprano’s permission
- After I’d retired, quietly admitted to feeling relief
- Detective with feeling about pressure for immunity
- Pass reduced commotion about parking permission
- Special permission over wearing fashionable pants inside
- Pansies don’t flourish outside current allotment
- Relief from pain in doses unfortunately taking time
- Coppers dash off base, no time for administration
Buddy explains!

The straight part
We know that "allotment" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case allotment = dispensation.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 DISPENSATION mean?
DISPENSATION noun- The act of dispensing or dealing out; distribution; often used of the distribution of good and evil by God to man, or more generically, of the acts and modes of his administration.
- That which is dispensed, dealt out, or appointed; that which is enjoined or bestowed
- A system of principles, promises, and rules ordained and administered; scheme; economy; as, the Patriarchal, Mosaic, and Christian dispensations.
- The relaxation of a law in a particular case; permission to do something forbidden, or to omit doing something enjoined; specifically, in the Roman Catholic Church, exemption from some ecclesiastical law or obligation to God which a man has incurred of his own free will (oaths, vows, etc.).