The most common and most likely answer to this crossword clue is the 7 letter word SPANGLE
I've seen this crossword clue in The Guardian
S
P
A
N
G
L
E
More clues leading to the result SPANGLE
- Sequin half gleams under bridge
- Pain left in extremely sore shiner
- small shiny decoration
- Shop’s exterior Xmas tree feature promoting the latest glitter
- Under lid of sparkly piano, view shiny disc
- Cook’s pan gleaming partly with glitter
- Resort misses out on a turn to shine
- Put glittery bits on fish after salt and pepper
Buddy explains!

The straight part
We know that "iner" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case iner = spangle.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 SPANGLE mean?
SPANGLE noun- A small piece of sparkling metallic material sewn on to a garment as decoration; a sequin.
- Any small sparkling object.
- The butterfly, Papilio demoleus, family Papilionidae, of Asia.
- Money.
- To sparkle, flash or coruscate.
- To fix spangles to; bespangle; to adorn with stars