Cryptic crossword clue
Fat mountain spreading; East Germany shocked! 13

The most common and most likely answer to this crossword clue is the 13 letter word FLABBERGASTED

I've seen this crossword clue in Financial Times
F
L
A
B
B
E
R
G
A
S
T
E
D

Buddy explains!

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

FLABBERGASTED verb
  1. To overwhelm with bewilderment; to amaze, confound, or stun, especially in a ludicrous manner.
FLABBERGASTED adjective
  1. Appalled, annoyed, exhausted or disgusted.
  2. Damned.

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