Ring from swimming facility returned (4)
I believe the answer is:
tyre
'ring' is the definition.
(I know that tyre is a type of ring)
'from swimming facility returned' is the wordplay.
'from' says the answer is hidden in the clue.
'TYRE' can be found hidden inside 'swimming facility returned'.
(Other definitions for tyre that I've seen before include "Wheel covering - Lebanese port" , "Rubber wheel; port" , "Pneumatic wheel cover" , "Seaport once famed for its purple dye" , "Wheel cover, may be tubeless" .)