Requires new seed to develop (5)
I believe the answer is:
needs
'requires' is the definition.
('need' can be a synonym of 'require')
'new seed to develop' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'to develop' is an anagram indicator.
'seed' with letters rearranged gives 'eeds'.
'n'+'eeds'='NEEDS'
(Other definitions for needs that I've seen before include "Requirements" , "Requires or lacks" , "Calls for" , "'..... must when the devil drives'" , "Things that are wanted" .)