Notice spinners are back? (4)
I believe the answer is:
spot
'notice' is the definition.
(spot can mean to notice or observe)
'spinners are back?' is the wordplay.
'spinners' becomes 'tops' (things that spin).
'are back?' is a reversal indicator.
'tops' in reverse letter order is 'SPOT'.
(Other definitions for spot that I've seen before include "See - blemish" , "Observe - place" , "Small mark or stain" , "awkward situation" , "Blob" .)