Possible Clues:

• Stopping by just briefly
• Like a fiddler's elbow in a donut blender
• Sporadically appearing then leaving
• Difficult to reach, and what 17-, 25-, 50- and 59-Across literally share
• Brief, as a visit
• Inconsistent bishop avoids scepticism following fashionable article
• Visiting only a short time
• "It was a very brief visit"
• Hard to reach at the office, say
• Quick, as an errand