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 defines the answer.
'child eating seconds' is the wordplay.
'child' becomes 'minor' (synonyms).
'eating' is an insertion indicator.
'seconds' becomes 'tau' (I can't explain this - if you can you should believe this answer much more).
'minor' enclosing 'tau' is 'MINOTAUR'.
'of' acts as a 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" .)