Jeopardise directions to new garden (8)
I believe the answer is:
endanger
'jeopardise' is the definition.
(I've seen this before)
'directions to new garden' is the wordplay.
'directions' becomes 'en' (I've seen this in other clues).
'to new' is an anagram indicator.
'garden' anagrammed gives 'danger'.
'en'+'danger'='ENDANGER'
(Other definitions for endanger that I've seen before include "Hazard" , "Expose to injury or extinction" , "Put in trouble" , "Put someone at risk" , "compromise" .)