Plant finds an opening as hunt develops (10)
I believe the answer is:
agapanthus
'plant' is the definition.
(agapanthus is a plant genus)
'an opening as hunt develops' is the wordplay.
'an' becomes 'a'.
'opening' becomes 'gap' (synonyms).
'develops' indicates an anagram.
'as'+'hunt'='ashunt'
'ashunt' anagrammed gives 'anthus'.
'a'+'gap'+'anthus'='AGAPANTHUS'
'finds' acts as a link.
(Other definitions for agapanthus that I've seen before include "garden plant" , "Flowers" , "Bloomer" , "flower" , "Southern African plant of the lily family -- haunts a gap (anag)" .)