Way to make a comeback with introduction of a Royal Society magazine (7)

I believe the answer is:
arsenal
'magazine' is the definition.
(both can mean an ammunition store)
'way to make a comeback with introduction of a royal society' is the wordplay.
'way' becomes 'L' (abbreviation for left).
'to make' becomes 'ane' (I can't justify this - if you can you should believe this answer much more).
'comeback' is a reversal indicator.
'with introduction of' is an insertion indicator.
'a royal society' becomes 'RS'.
'l'+'ane'+'a'='lanea'
'lanea' written backwards gives 'aenal'.
'aenal' going around 'rs' is 'ARSENAL'.
Can you help me to learn more?
(Other definitions for arsenal that I've seen before include "Cache of weapons or English soccer team" , "London football club - magazine" , "Highbury football team" , "favoured by some football supporters" , "weapons are kept here" .)
