Dark side of Sydney park? (4)
I believe the answer is:
hyde
'park?' is the definition.
(I've seen this before)
'dark side of sydney' is the wordplay.
'dark' becomes 'heavy' (synonyms).
'side of' says to hollow out the word (remove centre letters) (I've seen 'sides' mean this (only the letters on the sides are used)).
'sydney' becomes 'de' (I am not sure about this - if you are sure you should believe this answer much more).
'heavy' with its middle taken out is 'hy'.
'hy'+'de'='HYDE'
Can you help me to learn more?
(Other definitions for hyde that I've seen before include "See 15" , "Green space in London" , "Manchester town, London park" , "... the latter side of [EVIL] nature" , "Jekyll's alter ego" .)