The most common and most likely answer to this crossword clue is the 8 letter word FOOTLING
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More clues leading to the result FOOTLING
Buddy explains!

The straight part
We know that "of minor importance" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case of minor importance = footling.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 FOOTLING mean?
FOOTLING verb- To waste time; to trifle.
- To talk nonsense.
- Trivial, silly and irritating.
- A fetus oriented so that, at birth, its foot will emerge first. A type of breech birth.