Head to run and frolic (5)
I believe the answer is:
caper
'frolic' is the definition.
(I know that frolic can be written as caper)
'head to run' is the wordplay.
'head' becomes 'cape' (both can mean a piece of land jutting over the sea).
'to run' becomes 'r' (cricket abbreviation).
'cape'+'r'='CAPER'
'and' is the link.
(Other definitions for caper that I've seen before include "Frolic - bud used in cooking" , "Ridiculous escapade" , "Gambol" , "Pickled bud - escapade" , "prickly shrub" .)