The most common and most likely answer to this crossword clue is the 14 letter word TATTERDEMALION
I've seen this crossword clue in The Times
T
A
T
T
E
R
D
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M
A
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N
More clues leading to the result TATTERDEMALION
- Shabby tent, tailor-made originally
- Animal tottered about, a ragged creature
- Dilapidated tailor-made tent is thrown out
- Attend tailor, me? Unlikely
- Being abused detrimental to a scruffy person
- Tailor-made tent prepared for ragamuffin
- Scruffy person, awfully maltreated one in a fashion
- It's detrimental to a wayward tramp
Buddy explains!

The straight part
We know that "Dilapidated" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dilapidated = tatterdemalion.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 TATTERDEMALION mean?
TATTERDEMALION noun- A person with tattered clothing.
- Tattered.