Cryptic crossword clue
Endear fiancee regularly for a Guernsey lily, for example 6

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

I've seen this crossword clue in The Guardian
N
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Buddy explains!

The straight part
We know that "Guernsey lily, for example" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case guernsey lily, for example = nerine.
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 NERINE mean?

NERINE noun
  1. Any of various plants, of the genus Nerine, that are poisonous to cattle.

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