Singular aroma around garden site is distorted (4-5)
I believe the answer is:
skew-whiff
'site is distorted' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'singular aroma around garden' is the wordplay.
'singular' becomes 's' (abbreviation sometimes used in dictionaries).
'aroma' becomes 'whiff' (I can't justify this - if you can you should give a lot more credence to this answer).
'around' is an insertion indicator.
'garden' becomes 'kew' (Kew Gardens in London).
's'+'whiff'='swhiff'
'swhiff' placed around 'kew' is 'SKEW-WHIFF'.
Can you help me to learn more?
(Other definitions for skew-whiff that I've seen before include "Cockeyed" , "Not straight" , "Crooked - out of alignment" , "Awry" .)