Rests awkwardly on a girl's head (5)
I believe the answer is:
tress
'a girl's head' is the definition.
The definition and answer can be both body parts as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'rests awkwardly' is the wordplay.
'awkwardly' indicates anagramming the letters.
'rests' is an anagram of 'TRESS'.
'on' acts as a link.
Can you help me to learn more?
(Other definitions for tress that I've seen before include "Obsolete support" , "Braid of hair" , "Rests (anag.)" , "Long piece of hair" , "Long lock or plait of hair" .)