New garden has small hazards (7)
I believe the answer is:
dangers
'hazards' is the definition.
(I've seen this before)
'new garden has small' is the wordplay.
'new' is an anagram indicator.
'has' is a charade indicator (letters next to each other).
'small' becomes 's' (abbreviation - e.g. clothes size).
'garden' with letters rearranged gives 'danger'.
'danger'+'s'='DANGERS'
(Other definitions for dangers that I've seen before include "Hazards" , "Perils" , "Gardens (anag.)" .)