### Clue: Ray set about reading words of comfort repeatedly (6)
### Answer: MANTRA 
 ### Explanation: Definition: words of comfort repeatedly 
 MANTA(any of a family of ray fishes feeding on plankton) **containing**(set about) R(abbrev. for "reading", as in the basic "3 Rs" in school). I was held up, thinking of Man Ray, the artist, and trying to explain the last 3 letters of the answer in that context.