Being inside skating rink makes you smile (4)
I believe the answer is:
grin
'smile' is the definition.
(grinning is a kind of smiling)
'being inside skating rink' is the wordplay.
'being inside' indicates the answer is hidden within the clue.
'GRIN' can be found hidden inside 'skating rink'.
'makes you' is the link.
(Other definitions for grin that I've seen before include "Smile while pulling back the lips" , "Toothy smile" , "Beam" , "11 smile" , "Look pleased" .)