Not straight, like some gardens (5)
I believe the answer is:
askew
'not straight' is the definition.
(I've seen this before)
'like some gardens' is the wordplay.
'like' becomes 'as'.
'some gardens' becomes 'kew' (Kew Gardens in London).
'as'+'kew'='ASKEW'
(Other definitions for askew that I've seen before include "Lopsided" , "Obliquely" , "irregular" , "Leaning to one side" , "Not true" .)