### Clue: Teacher turning to take on very loud musical pieces (5)
### Answer: RIFFS 
 ### Explanation: Definition: musical pieces
 **Reversal of**(… turning) SIR(form of address for a male teacher) **containing**(to take on) FF(abbrev. for "fortissimo", a musical direction to play very loudly).
Defn: Short repeated phrases in popular music or jazz.