Big female bird with a head buried (8)
I believe the answer is:
titaness
'big female' is the definition.
'bird with a head buried' is the wordplay.
'bird with' becomes 'tit' (I've seen this before. I am not sure about the 'with' bit.**).
'head' becomes 'ness' (ness is a headland).
'buried' means one lot of letters go next to another (in a down clue, some letters go beneath others).
'tit'+'a'+'ness'='TITANESS'
Can you help me to learn more?
(Other definitions for titaness that I've seen before include "immortal" , "ogre" , "big girl" , "Phoebe, say" , "Giant woman" .)