Cryptic crossword clue
Large mammal in river — or bird passing over one 7

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

R
O
R
Q
U
A
L

Buddy explains!

The straight part
We know that "Large mammal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case large mammal = rorqual.
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 RORQUAL mean?

RORQUAL noun
  1. Any whale of family Balaenopteridae, with longitudinal skin folds running from below the mouth to the navel, allowing the capacity of the mouth to expand greatly when feeding.

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