Tenor Domingo's initial break (5)
I believe the answer is:
drift
'tenor' is the definition.
(I know that Drift is a type of tenor)
'domingo's initial break' is the wordplay.
'initial' says to take the initial letters.
'break' becomes 'rift' (rift can mean a break or opening).
The first letter of 'domingos' is 'd'.
'd'+'rift'='DRIFT'
(Other definitions for drift that I've seen before include "move around without end" , "(Of snow) blow into heaps" , "Snow heaped up by wind" , "See 8" , "Move with wind and tide" .)