Snog in park is sensual (4)
I believe the answer is:
kiss
'snog' is the definition.
(I've seen this before)
'in park is sensual' is the wordplay.
'in' says the answer is hidden in the clue.
'KISS' is hidden in the letters of 'park is sensual'.
(Other definitions for kiss that I've seen before include "Eg, smacker, peck" , "Caress with lips" , "Greet with lips" , "Act of love" , "Act of osculation" .)