Guy is into pasta – yummy! (4)
I believe the answer is:
stay
'guy' is the definition.
(thesaurus)
'into pasta yummy' is the wordplay.
'into' indicates the answer is hidden within the clue.
'STAY' can be found hidden inside 'pasta yummy'.
'is' is the link.
(Other definitions for stay that I've seen before include "Temporary residence" , "Period in one place" , "Rope to brace an upright" , "Don't go!" , "Put off - visit" .)