Computer language with secure structure executed (7)
I believe the answer is:
fortran
'computer language' is the definition.
(I've seen this before)
'with secure structure executed' is the wordplay.
'with' means one lot of letters go next to another.
'secure structure' becomes 'fort' (fort is a kind of structure. I am not sure about the 'secure' bit.).
'executed' becomes 'ran' (execute can mean to run or administrate).
'fort' put next to 'ran' is 'FORTRAN'.
Can you help me to learn more?
(Other definitions for fortran that I've seen before include "Language of PC" , "programming language" , "Coded language" , "computer language" .)