See fair play in the nursery (7)
I believe the answer is:
freesia
'the nursery' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'see fair play' is the wordplay.
'play' indicates an anagram.
'see'+'fair'='seefair'
'seefair' is an anagram of 'FREESIA'.
'in' is the link.
Can you help me to learn more?
(Other definitions for freesia that I've seen before include "Highly scented flower" , "Plant of the iris genus" , "Scented plant from South Africa" , "Fragrant-flowered plant; faeries (anag.)" , "Sea rife with these odd flowers" .)