Kissing when hugging wild raver is stressful (5-7)
I believe the answer is:
nerve-racking
'is stressful' is the definition.
(synonyms)
'kissing when hugging wild raver' is the wordplay.
'kissing' becomes 'necking' (synonyms).
'when hugging' indicates putting letters inside.
'wild' indicates anagramming the letters.
'raver' with letters rearranged gives 'rvera'.
'necking' going around 'rvera' is 'NERVE-RACKING'.
(Other definitions for nerve-racking that I've seen before include "Harrowing" , "Causing great anxiety" , "Stressful" .)