@Xyz , practically , internship or 1 year diploma , never saves the gap year. If you are planning to apply in the corporate , this year , will be counted as a gap year in your academic records. So the only way to save it is - job , or take regular admission in some college voluntarily or via agent ( you will not have to attend classes in that case ) . However , if the sole purpose of taking an internship or diploma is for enlightening your mind , then definitely go ahead. In research , gap year is not given much importance.
In which field are you planning to specialise in your masters ? One way could be , to approach the professors , on your own ( better if you personally know someone ) , and take internship under them. Or you can join a diploma course under any finance or other research institute. There are many private colleges which provide diploma in various courses. Google !!
"Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth."