The most common and most likely answer to this crossword clue is the 13 letter word INSIGNIFICANT
I've seen this crossword clue in The Daily Telegraph
I
N
S
I
G
N
I
F
I
C
A
N
T
More clues leading to the result INSIGNIFICANT
- Is financing it in a new way not worth considering?
- Not worth bothering with financing — it is complicated
- Very little in clue, if I have no ability
- Financing it is silly, meaningless
- Cool instruction to assistant dealing with letters seen as trivial
- Financing IT is reviewed as very minor
- Minor is financing IT complex
- Section removed from main sign if I can, though it’s not important
- It's meaningless in character, provided one tilt
- Corrupt financing – is it not important?
Buddy explains!

The straight part
We know that "trivial" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case trivial = insignificant.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 INSIGNIFICANT mean?
INSIGNIFICANT adjective- Not significant; not important, inconsequential, or having no noticeable effect.
- Without meaning; not signifying anything.