Cryptic crossword clue
Mammal on metro upset me 9

The most common and most likely answer to this crossword clue is the 9 letter word MONOTREME

I've seen this crossword clue in The Guardian
M
O
N
O
T
R
E
M
E

Buddy explains!

The straight part
We know that "Mammal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mammal = monotreme.
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 MONOTREME mean?

MONOTREME noun
  1. A mammal that lays eggs and has a single urogenital and digestive orifice. Only the echidnas and platypuses are included in this group
MONOTREME adjective
  1. (of a pollen grain) Having a single trema, or aperture.

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