Woman has called regularly to announce … (6)
I believe the answer is:
herald
'announce' is the definition.
(synonyms)
'woman has called regularly' is the wordplay.
'woman' becomes 'her' (pronoun for a woman).
'has' is a charade indicator (letters next to each other).
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternate letters of 'called' are 'ald'.
'her'+'ald'='HERALD'
'to' is the link.
(Other definitions for herald that I've seen before include "Scottish newspaper" , "and 14: 'Hark! The -- -- sing' (carol)" , "Proclaimer" , "Ceremonial messenger" , "Bringer of news" .)