### Clue: Scientific solver admits he is perplexed by abbreviation of name on computer (7,5)
### Answer: APPLIED MATHS 
 ### Explanation: Definition: Scientific solver
 **Anagram of**(…is perplexed) ADMITS HE **placed after**(by) "Apple"(name on computers made by Apple Inc.) **minus its last letter of**(abbreviation …).
Defn: Discipline used, with other tools, to solve many scientific problems.