Cryptic crossword clue
Supporter is interrupting scrap 5

The most common and most likely answer to this crossword clue is the 5 letter word JOIST

I've seen this crossword clue in The Daily Telegraph
J
O
I
S
T


Buddy explains!

The straight part
We know that "Supporter" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case supporter = joist.
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 JOIST mean?

JOIST noun
  1. A piece of timber laid horizontally, or nearly so, to which the planks of the floor, or the laths or furring strips of a ceiling, are nailed.
JOIST verb
  1. To fit or furnish with joists.

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