Selectively drawn and prepared to grow (6)
I believe the answer is:
seeded
'selectively drawn' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives can occasionally define each other.
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for seeded that I've seen before include "Graded in first 16 players of tennis tournament" , "Ranked in first 16 of tennis tournament" , "set for growth" , "In tennis tournament, graded in first sixteen" , "top players?" .)