The most common and most likely answer to this crossword clue is the 7 letter word BLEMISH
B
L
E
M
I
S
H
More clues leading to the result BLEMISH
- Some terrible mishap brings scar
- Imperfection in emblem is horrible
- Some terrible mishap results in a scar
- Defect with Miles, Dicky and Henry after start of back-stabbing
- Mark needing book on language, skipping the introduction
- Terrible mishap covers flaw
- Terrible mishmash masking defect
- Problem is hard, producing bad mark?
- I shamble around concealing a deformity
- Part of the problem is his acne?
Buddy explains!

The straight part
We know that "deformity" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case deformity = blemish.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 BLEMISH mean?
BLEMISH noun- A small flaw which spoils the appearance of something, a stain, a spot.
- A moral defect; a character flaw.
- To spoil the appearance of.
- To tarnish (reputation, character, etc.); to defame.