Possible Clues:

• Acidity of beer with a head on
• Resentment of female living in the Fens?
• Acrimony in flier -- conclusion often reached by females
• Female marsh bird apparently showing resentment
• Bird being deprived of tail and spleen
• Resentment of booming female?
• Resentment of female marsh bird apparently
• Acrimony
• Resentment of female boomer?
• Female bird of the heron family apparently shows bad feeling