Lock of hair given emphasis — not the first (5)
I believe the answer is:
tress
'lock of hair' is the definition.
(I've seen this before)
'emphasis not the first' is the wordplay.
'emphasis' becomes 'stress' (stress is a kind of emphasis).
'not the first' means to remove the first letter.
'stress' with its first letter taken off is 'TRESS'.
'given' acts as a link.
(Other definitions for tress that I've seen before include "Bit of hair" , "Long lock or plait of hair" , "Rests (anag.)" , "Obsolete support" , "Curl - lock" .)