Cryptic crossword clue
Walls in igloo’s first high summer 7

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

I've seen this crossword clue in Financial Times
I
M
M
U
R
E
S


Buddy explains!

The straight part
We know that "Walls in" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case walls in = immures.
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 IMMURES mean?

IMMURES verb
  1. To cloister, confine, imprison: to lock up behind walls.
  2. To put or bury within a wall.
  3. (of a growing crystal) To trap or capture (an impurity); chiefly in the participial adjective immured and gerund or gerundial noun immuring.

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