The most common and most likely answer to this crossword clue is the 8 letter word NIGHTJAR
I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result NIGHTJAR
- Beer in the evening for this bird?
- Swift’s relative rejection of governor’s lead in Indian rule, weak
- Tweeter's bedtime tipple?
- Flier, a man of honour, forgoes his first drink
- Bird near sailor inspiring Jack
- Bird and man audibly clash
- Bird near foot of mast on vessel
- Winger‘s bedtime drink?
- Flier near pitch around the centre of Dijon
- Bird‘s bedtime drink?
Buddy explains!

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 NIGHTJAR mean?
NIGHTJAR noun- Any of various medium-sized nocturnal birds of the family Caprimulgidae, that feed predominantly on moths and other large flying insects.