Note brick-carrier brought back (3)
I believe the answer is:
doh
'note' is the definition.
(alternative spelling of 'do' as in do re mi)
'brick-carrier brought back' is the wordplay.
'brick carrier' becomes 'hod' (I've seen this before).
'brought back' says the letters should be written backwards.
'hod' backwards is 'DOH'.
(Other definitions for doh that I've seen before include "Stupid me!" , "First of the series at 17 Across" , "First note of musical scale" , "Homer Simpson's exasperated cry" , "Tonic (mus.)" .)