Cryptic crossword clue
Metrical patterns in book one French friend carries 5

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

I've seen this crossword clue in The Times
I
A
M
B
I


Buddy explains!

The straight part
We know that "Metrical patterns" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case metrical patterns = iambi.
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 IAMBI mean?

IAMBI noun
  1. An iamb

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