The most common and most likely answer to this crossword clue is the 10 letter word COMPARABLE
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More clues leading to the result COMPARABLE
Buddy explains!

The straight part
We know that "Similar" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case similar = comparable.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 COMPARABLE mean?
COMPARABLE noun- Something suitable for comparison.
- (often with to) Able to be compared (to).
- (often with to) Similar (to); like.
- Constituting a pair in a particular partial order.
- (grammar) Said of an adjective that has a comparative and superlative form.