### Clue: Chemical agent has second name in support needing no introduction (7)
### Answer: HORMONE 
 ### Explanation: Definition: Chemical agent
 [MO(short for "moment"/a second/a very short time) + N(abbrev. for "name")] **contained in**(in) "shore"(a support/a prop or beam against something weak) **minus ****its 1st letter**(needing no introduction).
Defn: … /an ingredient in your body chemistry.