### Clue: Coarseness in heartless song when following college rugby (7)
### Answer: CRUDITY 
 ### Explanation: Definition: Coarseness
 "ditty"(a short simple song) **minus** **its middle letter**(heartless …) **placed below **(when following, in a down clue) [C(abbrev. for "college") + RU(abbrev. for "Rugby Union" or just "rugby", the game)].