A spray, perhaps, the so rich spoiled daughter goes in for (7)
I believe the answer is:
orchids
'a spray perhaps the' is the definition.
I can't tell whether this defines the answer.
'rich spoiled daughter goes in for' is the wordplay.
'spoiled' is an anagram indicator.
'daughter' becomes 'd' (genealogical abbreviation).
'goes in' is an insertion indicator.
'for' becomes 'os' (I can't justify this - if you can you should believe this answer much more).
'rich' with letters rearranged gives 'rchi'.
'rchi'+'d'='rchid'
'rchid' placed into 'os' is 'ORCHIDS'.
'so' acts as a link.
Can you help me to learn more?
(Other definitions for orchids that I've seen before include "Chords I turn into flowers" , "Glamorous tropical flowers" , "Fine tropical flowers" , "Flowers from a rich sod" , "Showy plants" .)