16 down
Youngster
on
tour
of
Korea
working
to
become
firmly
established
(4,4)
Youngster on tour of Korea working to become firmly established (4,4)
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The definition is at the end of the clue.
How the clue works
The answer means become firmly established, as in a plant putting down roots. Take TOT for 'youngster', then take the letters of 'Korea' and jumble them (that's the 'working' part) to get AKERO, tucking that anagram inside TOT — signalled by 'on tour of' — to give TAKE ROOT.