Chiller regularly seen in kitchen (3)
I believe the answer is:
ice
'chiller' is the definition.
(I've seen this in another clue)
'regularly seen in kitchen' is the wordplay.
'regularly seen in' indicates alternate letters.
The alternating letters of 'kitchen' are 'ICE'.
(Other definitions for ice that I've seen before include "Decorate a cake" , "Chill - harden" , "Decorate with frosting" , "Winter formation" , "Diamonds (sl)" .)