That woman's lad played trumpet (6)
I believe the answer is:
herald
'trumpet' is the definition.
(thesaurus)
'that woman's lad played' is the wordplay.
'that woman' becomes 'her' (I've seen this before**).
'played' indicates an anagram.
'lad' with letters rearranged gives 'ald'.
'her'+'ald'='HERALD'
(Other definitions for herald that I've seen before include "Signal the arrival of" , "and 14: 'Hark! The -- -- sing' (carol)" , "One making proclamations - harbinger" , "Bringer of news" , "Harbinger, precursor" .)