Gloria, poorly, received by doctor in plant (8)
I believe the answer is:
marigold
'plant' is the definition.
The answer is an example.
'gloria poorly received by doctor' is the wordplay.
'poorly' indicates an anagram.
'received by' is an insertion indicator.
'doctor' becomes 'md' ('MD' can be a synonym of 'doctor').
'gloria' anagrammed gives 'arigol'.
'arigol' inserted inside 'md' is 'MARIGOLD'.
'in' acts as a link.
(Other definitions for marigold that I've seen before include "Bright orange-yellow garden flower" , "floral item" , "The flower has a gold rim, oddly" , "Garden plant of the daisy family" , "Orange daisy" .)