Jumble: coats, bra, tumblers (8)
I believe the answer is:
acrobats
'tumblers' is the definition.
('acrobat' can be a synonym of 'tumbler')
'jumble coats bra' is the wordplay.
'jumble' indicates anagramming the letters.
'coats'+'bra'='coatsbra'
'coatsbra' anagrammed gives 'ACROBATS'.
(Other definitions for acrobats that I've seen before include "Circus folk" , "Funambulists" , "They perform feats of balance" , "Gymnasts; tumblers" , "Gymnastic performers" .)