Cryptic crossword clue
For Armstrong, it’s Aldrin that takes the strain 8

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

I've seen this crossword clue in The Guardian
C
O
L
A
N
D
E
R


Buddy explains!

The straight part
We know that "that takes the strain" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case that takes the strain = colander.
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 COLANDER mean?

COLANDER noun
  1. A bowl-shaped kitchen utensil with holes in it used for draining food such as pasta.

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