Bear up, band (4)
I believe the answer is:
hoop
'band' is the definition.
(I've seen this before)
'bear up' is the wordplay.
'bear' becomes 'pooh' (Winnie the Pooh).
'up' is a reversal indicator (in down clue: letters go upwards).
'pooh' in reverse letter order is 'HOOP'.
(Other definitions for hoop that I've seen before include "Circle of wood etc" , "round during dance" , "children's toy" , "Circular band; child's toy" , "Metal ring for croquet and basketball" .)