Cryptic crossword clue
Growing medium vegetable at end of allotment

The most common and most likely answer to this crossword clue is the 4 letter word PEAT

I've seen this crossword clue in Independent
P
E
A
T


Buddy explains!

The straight part
We know that "Growing medium" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case growing medium = peat.
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 PEAT mean?

PEAT noun
  1. Soil formed of dead but not fully decayed plants found in bog areas, often burned as fuel.
PEAT noun
  1. A pet, a darling; a woman.

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