Announce that woman's hairless except head (6)
I believe the answer is:
herald
'announce' is the definition.
(synonyms)
'woman's hairless except head' is the wordplay.
I cannot really see how this works, but
'woman's' could be 'her' (belonging to a woman) and 'her' is present in the answer.
The remaining letters 'ald' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'that' acts as a link.
Can you help me to learn more?
(Other definitions for herald that I've seen before include "One making proclamations - harbinger" , "Presage for old announcer" , "Proclaimer" , "Harbinger, precursor" , "Announce, presage" .)