Cryptic crossword clue
Extremely overenthusiastic cuddle may be blocked 8

The most common and most likely answer to this crossword clue is the 8 letter word OCCLUDED

I've seen this crossword clue in Financial Times
O
C
C
L
U
D
E
D

Buddy explains!

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

OCCLUDED verb
  1. To obstruct, cover, or otherwise block (an opening, a portion of an image, etc.).
  2. To absorb, as a gas by a metal.
OCCLUDED adjective
  1. Closed or obstructed
  2. (of air) forced upwards by colder, denser air

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