Bird biting horse and wild dog, which is risky (5,3,2)
I believe the answer is:
touch and go
'is risky' is the definition.
(I've seen this before)
'bird biting horse and wild dog' is the wordplay.
I cannot quite see how this works, but
'horse' could be 'h' (abbreviation as in horse power) and 'h' is located in the answer.
'bird' could be 'toucan' (toucan is a kind of bird) and 'toucan' is located in the remaining letters.
an anagram of 'dog' is 'dgo' which is within the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'which' is the link.
Can you help me to learn more?
(Other definitions for touch and go that I've seen before include "Dubious" , "Dicey" , "Critical - risky" , "advice recommending the briefest of contacts?" , "Risky advice" .)