Neck in stork is stretched (4)
I believe the answer is:
kiss
'neck' is the definition.
(kissing is a kind of necking)
'in stork is stretched' is the wordplay.
'in' indicates a hidden word.
'KISS' is hidden in the letters of 'stork is stretched'.
(Other definitions for kiss that I've seen before include "Salute" , "Peck, smacker, X" , "Press the lips against" , "x (that may be French)" , "Expression of love" .)