The most common and most likely answer to this crossword clue is the 4 plus 6 letter word SAND MARTIN
I've seen this crossword clue in The Guardian
S
A
N
D
M
A
R
T
I
N
More clues leading to the result SAND MARTIN
- Have man raid nest naughtily, with no care ultimately for bird
- Son and another boy, summer visitor
- Bird originally seen with a patron saint of France
- Bird with nests in stylish home
- Pictures of a painfully seductive nature in flier
- Bird is sleep inducer, having right initial intonation
- Flyer written by two writers named George
- Pain mixed with pleasure meeting resistance after a time by home bird
- S&M skill: I Never, not ever swallow
- Bird shows skill in following deviant sexual practice
Buddy explains!
The straight part
We know that "flier / flier" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case flier / flier = sand martin.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.