Plant in Grenada I built (8)
I believe the answer is:
gardenia
'plant in' is the definition.
'gardenia' can be an answer for 'plant' (I've seen this before). I'm not sure about the 'in' bit.
'grenada i built' is the wordplay.
'built' indicates an anagram (the same letters can be used to build the answer).
'grenada'+'i'='grenadai'
'grenadai' with letters rearranged gives 'GARDENIA'.
Can you help me to learn more?
(Other definitions for gardenia that I've seen before include "Drainage for shrub with white or yellow flowers" , "Shrub; drainage (anag.)" , "Fragrant tree or shrub" , "Shrub with fragrant flowers - in Grade A (anag)" , "Drainage (anag) -- plant" .)