The most common and most likely answer to this crossword clue is the 7 letter word LUNETTE
L
U
N
E
T
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E
More clues leading to the result LUNETTE
- Rubber packing-ring wrapped round clear watchglass
- Window mesh used in one of the strings?
- Novelist Kathy penning 1, The Crescent
- Crescent shape clear in stringed instrument
- Take home filling to seal opening
- Ordered toilet mesh that lets in light
- Sickly looking, here the host is all clear for probing instrument
- Arched glass bottle; last third holds a French dry
- Aperture in instrument plugged with open fabric
- Incomplete communication over a French aperture
Buddy explains!

The straight part
We know that "aperture" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case aperture = lunette.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 LUNETTE mean?
LUNETTE noun- A small opening in a vaulted roof of a circular or crescent shape.
- A crescent-shaped recess or void in the space above a window or door.
- An image or other representation of a crescent moon.
- (fortifications) A field work consisting of two projecting faces forming a wedge each of which extends from one of two parallel flanks.
- A luna: a crescent-shaped receptacle, often glass, for holding the (consecrated) host (the bread of communion) upright when exposed in the monstrance.
- A type of flattened glass used in watch-making.
- The circular hole in the guillotine in which the victim's neck is placed.
- A type of crescent-shaped dune blown up along a lake basin, especially in dry areas of Australia.
- A half horseshoe, lacking the sponge.
- A piece of felt to cover the eye of a vicious horse.
- An iron shoe at the end of the stock of a gun carriage.
- (in the plural) See lunettes.