The most common and most likely answer to this crossword clue is the 10 letter word COMPARISON
I've seen this crossword clue in The Daily Telegraph
C
O
M
P
A
R
I
S
O
N
More clues leading to the result COMPARISON
- Evaluation of panic rooms needing revision
- Firm with million plus capital working for association
- Moronic sap fabricated likeness
- City replaces masthead in general correspondence
- Convict receiving honour with capital city offering something odious?
- Contrast second century uprising with Trojan one, briefly
- Commander with map barking ‘Retreating, no sir!’ gets distinction
- Contrast MP in Cairo cavorting with relative
- What may be seen as odious online activity to save money?
- Similarity of remodelled panic rooms
Buddy explains!

The straight part
We know that "Contrast" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case contrast = comparison.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 COMPARISON mean?
COMPARISON noun- The act of comparing or the state or process of being compared.
- An evaluation of the similarities and differences of one or more things relative to some other or each-other.
- With a negation, the state of being similar or alike.
- (grammar) The ability of adjectives and adverbs to form three degrees, as in hot, hotter, hottest.
- That to which, or with which, a thing is compared, as being equal or like; illustration; similitude.
- A simile.
- The faculty of the reflective group which is supposed to perceive resemblances and contrasts.