Clue: Are they sent for if popes, say, act so strangely? (3,2,5,5)
Answer: MEN IN WHITE COATS
Explanation: Definition: Are they sent for if popes, say, act so strangely?
My original comment – *Cryptic definition, I think. "The men in white coats" are said to be sent to collect mad people, and popes wear white vestments.* Travatore has pointed out a better parsing – **MEN IN WHITE** ("popes") + ***(act so)