Cryptic crossword clue
See bird lay egg possibly after crossing river 7

The most common and most likely answer to this crossword clue is the 7 letter word GREYLAG

I've seen this crossword clue in The Daily Telegraph
G
R
E
Y
L
A
G

Buddy explains!

The straight part
We know that "bird" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bird = greylag.
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 GREYLAG mean?

GREYLAG noun
  1. A large grey European goose, Anser anser, with pink legs and dull orange beak.

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