Casino token in daycare centre... cool (4)
I believe the answer is:
chip
'casino token' is the definition.
(I've seen this in another clue)
'daycare centre cool' is the wordplay.
'centre' indicates the central letters.
'cool' becomes 'hip' (hip can mean cool or fashionable).
The centre of 'daycare' is 'c'.
'c'+'hip'='CHIP'
'in' is the link.
(Other definitions for chip that I've seen before include "Off the old block, that's junior" , "Golf shot; item of fried food" , "Slice - approach shot in golf" , "Small piece of wood" , "Deep-fried potato slice" .)