Stressed about ringlet (5)
I believe the answer is:
tress
'ringlet' is the definition.
(I've seen this in another clue)
'stressed about' is the wordplay.
'about' indicates a hidden word (the clue goes around or about the answer).
'TRESS' can be found hidden inside 'stressed'.
(Other definitions for tress that I've seen before include "Long piece of hair" , "Braid of hair" , "Bit of hair" , "Obsolete support" , "Long lock or plait of hair" .)