The most common and most likely answer to this crossword clue is the 11 letter word COALESCENCE
I've seen this crossword clue in The Times
C
O
A
L
E
S
C
E
N
C
E
Buddy explains!
The straight part
We know that "Blending" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case blending = coalescence.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 COALESCENCE mean?
COALESCENCE noun- The act of coalescing.
- The merging of two segments into one.