Possible Clues:

• Many are combed regularly
• Hair on some 74 Across
• Things which can link Verdi, WG Grace and Roy Wood
• Shadows that have grown long?
• Goatees and others
• Van Dyke and Lincoln, for example, in Panda with detective
• What many ''Survivor'' contestants wear
• Billy goat features
• Results of not cutting it close?
• Things studied by pogonologists