Child eating seconds of steak made our bull cross (8)
I believe the answer is:
minotaur
'steak made our bull cross' is the definition.
I can't tell whether this definition defines the answer.
'child eating seconds' is the wordplay.
'child' becomes 'minor' (synonyms).
'eating' is an insertion indicator.
'seconds' becomes 'tau' (I am not sure about this - if you are sure you should believe this answer much more).
'minor' enclosing 'tau' is 'MINOTAUR'.
'of' is the link.
Can you help me to learn more?
(Other definitions for minotaur that I've seen before include "Monster in a maze with the head of a bull and the body of a man" , "Beast of legend" , "Mythical man-bull" , "50 per cent ruminant" , "Mythical beast of Crete" .)