The most common and most likely answer to this crossword clue is the 6 letter word FINERY
I've seen this crossword clue in The Times
F
I
N
E
R
Y
More clues leading to the result FINERY
- Rail watchdog’s curt recommendation that’s put on for show?
- Best gear from very narrow railway
- Fancy clothes, fashionable, end of line, confiscated by Quaker Elizabeth?
- Knight invested in gleaming decorations
- The very best clothes are about to leave processing plant
- Knight gets irritable going around in splendour
- Passionate about new decorations
- Good things to be put on penalty lines
Buddy explains!

The straight part
We know that "Best gear" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case best gear = finery.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 FINERY mean?
FINERY noun- Fineness; beauty.
- Ornament; decoration; especially, excessive decoration; showy clothes; jewels.
- (ironworking) A charcoal hearth or furnace for the conversion of cast iron into wrought iron, or into iron suitable for puddling.