### Clue: Compose nerves, not very easy initially, and head for tranquillity (10)
### Answer: SERENENESS 
 ### Explanation: Definition: tranquillity
 **Anagram of**(Compose) "nerves" **minus**(not) "v"(abbrev. for "very") + **the 1st letter of**(… initially) "easy " **plus**(and) NESS(a headland;a cape).