Threat in wild garden (6)
I believe the answer is:
danger
'threat' is the definition.
(I've seen this before)
'wild garden' is the wordplay.
'wild' is an anagram indicator.
'garden' is an anagram of 'DANGER'.
'in' acts as a link.
(Other definitions for danger that I've seen before include "Peril, hazard" , "Ranged about in some peril" , "'Peril, risk (6)'" , "Menace" , "Red flag, for example" .)