Cryptic crossword clue
Old flour ground in shed is resistant to the elements 6,4

The most common and most likely answer to this crossword clue is the 6 plus 4 letter word COLOUR FAST

I've seen this crossword clue in The Guardian
C
O
L
O
U
R
F
A
S
T

Buddy explains!

The straight part
We know that "resistant to the elements" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case resistant to the elements = colour fast.
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 COLOUR FAST mean?

COLOUR FAST adjective
  1. Having colors that have been dyed or applied to the material in a way that will prevent them from being washed out, running, or fading.

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