That womans lad turned out a forerunner (6)
I believe the answer is:
herald
'a forerunner' is the definition.
(I know that forerunner can be written as herald)
'that womans lad turned out' is the wordplay.
'that womans' becomes 'her' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'turned out' indicates anagramming the letters (turn out can mean to organise).
'lad' with letters rearranged gives 'ald'.
'her'+'ald'='HERALD'
Can you help me to learn more?
(Other definitions for herald that I've seen before include "Presage for old announcer" , "Harbinger, precursor" , "One making proclamations - harbinger" , "Proclaim the approach of, like announcer of old" , "Signal the arrival of" .)