14 across
Ruin
preparation
of
minute
steak:
two
internationals
sacked
(6)
Ruin preparation of minute steak: two internationals sacked (6)
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The definition is at the beginning of the clue.
How the clue works
The definition is Ruin — something that undoes or destroys. You take MINUTE STEAK, boot out two "internationals" — that's TEST (a cricket test match) and I (the abbreviation for international) — leaving you with MNUEAK, then preparation of those letters (an anagram) gives you your answer.