this will cause function to repeat itself if there is more than one rcolor jField in the form...
please use this:
jQuery('body').on('click', '.btn-reset-color-value-<?php echo $attributes['id']; ?>', function(){
				jQuery('#<?php echo $attributes['id']; ?>').minicolors('value','');
			});

and add btn-reset-color-value-<?php echo $attributes['id']; ?> to the class of your <a>