Have a slice of cake at teatime (3)
I believe the answer is:
eat
'have' is the definition.
(I know that eat is a more specific form of the action have)
'a slice of cake at teatime' is the wordplay.
'a slice of' indicates the answer is hidden within the clue.
'EAT' is hidden in the letters of 'cake at teatime'.
(Other definitions for eat that I've seen before include "Gobble up" , "Partake of" , "Scoff" , "Dine in a restaurant" , "Break bread" .)