15/17 across
Become
the
best
by
baking
bread
or
a
little
rock
cake
(5,1,6)
Become the best by baking bread or a little rock cake (5,1,6)
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The definition is at the beginning of the clue.
How the clue works
Become the best is the definition. The word "baking" is the anagram indicator, telling you to rearrange the letters of "bread", "or", "cake" plus R (a "little" bit, i.e. the first letter, of "rock"), which together jumble up to give BREAK A RECORD.