Cryptic crossword clue
A lack of memory set back relative of 12 5

The most common and most likely answer to this crossword clue is the 5 letter word MARON

M
A
R
O
N

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The straight part
We know that "relative of 12" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case relative of 12 = maron.
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.

Crossword Answer definitions

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