Cryptic crossword clue
Yesteryear’s lover, flighty type who is non-resident? 6

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

I've seen this crossword clue in The Daily Telegraph
E
X
T
E
R
N

Buddy explains!

The straight part
We know that "non-resident" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case non-resident = extern.
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 EXTERN mean?

EXTERN noun
  1. A person affiliated with an institution in a lesser capacity, for example, as a non-resident or as a part-time affiliate.
  2. Outward form or part; exterior.
EXTERN adjective
  1. External; outward; not inherent
EXTERN noun
  1. In the C and C++ programming languages, a variable that can be separately declared in many places, all of them referring to the same variable.

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