Everything, for example, that is in or first shown in moral tales (10)
I believe the answer is:
allegories
'moral tales' is the definition.
'allegories' can be an answer for 'tales'. I'm unsure of the 'moral' bit.
'everything for example that is in or first shown' is the wordplay.
'everything' becomes 'all' (all things).
'for example' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'in' means one lot of letters goes inside another.
'first shown' becomes 's' (1st letter of 'shown').
'or'+'s'='ors'
'ie' put within 'ors' is 'ories'.
'all'+'eg'+'ories'='ALLEGORIES'
'in' acts as a link.
Can you help me to learn more?
(Another definition for allegories that I've seen is " Symbolic narratives".)