Hardy girl grabbing Romeo's hair (5)
I believe the answer is:
tress
'hair' is the definition.
(tress is a kind of hair)
'hardy girl grabbing romeo's' is the wordplay.
'hardy girl' becomes 'tess' (in Tess of the d'Urbervilles, Thomas Hardy novel).
'grabbing' indicates putting letters inside.
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'tess' placed around 'r' is 'TRESS'.
(Other definitions for tress that I've seen before include "Long piece of hair" , "Curl - lock" , "Switch" , "Long lock or plait of hair" , "is a bit of a shock" .)