I see nobody mentioned conversion rate optimisation (CRO) as being a possible solution to OP's low click-through rate (CTR).
Here's an example for you OP, albeit a
very exaggerated one: let's say your keyword is "heavy duty flashlights" (
flashlights, not
fleshlights) and you're ranking in the 3rd position. The top 3 fictional results are as follows:
1. Heavy Duty Flashlights: The Best In The Industry
reputablewebsite#1.com
This heavy-duty flashlight packs a punch with an impressive 850 lumens...
2. High Quality Heavy Duty Flashlights For The Handyman In You
wellknownwebsite#2.com
Heavy-duty flashlights pack a ton of light into your hand. Need more light? Lantern flashlights flood the area with light...
3. getting heavy duty flashlight today at low very prise
This website may be hacked
joeflashlights.com
we sell heavy duty flashlight 4 prise that unmatching even walmart
Out of those 3 examples, which one are web users the least likely to pick? That's right, the 3rd one. However, if the owner of the 3rd website cleaned up the title, cleaned up the description (by making it more appealing to their target consumer) and removed the hacked site warning; the site would most likely see an improvement in their CTR.
In your case, since you're already ranking well for the keyword, it might be worth your time to figure out why web searchers aren't clicking on your result in the search engine results pages (SERPs) and improve the appearance of your result to increase your CTR.
Additionally, this is something to keep in mind when you're looking at data for a keyword:
http://searchengineland.com/heck-going-google-keyword-planner-253062