Body parts goatee thankfully hides (5)
I believe the answer is:
teeth
'body parts' is the definition.
(tooth is a kind of body part)
'goatee thankfully hides' is the wordplay.
'hides' indicates a hidden word.
'TEETH' can be found hidden inside 'goatee thankfully'.
(Other definitions for teeth that I've seen before include "Effective power" , "Gnashers" , "watchdog needs these" , "rarely a hen's" , "Structures in the jaws" .)