The most common and most likely answer to this crossword clue is the 11 letter word COEFFICIENT
I've seen this crossword clue in The Times
C
O
E
F
F
I
C
I
E
N
T
Buddy explains!
The straight part
We know that "part of term" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case part of term = coefficient.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 COEFFICIENT mean?
COEFFICIENT noun- A constant by which an algebraic term is multiplied.
- A number, value or item that serves as a measure of some property or characteristic.
- Cooperating