Frolics, runs off in places jutting in to the sea (5)
I believe the answer is:
capes
'places jutting in to the sea' is the definition.
I can't tell whether this definition defines the answer.
'frolics runs off' is the wordplay.
'frolics' becomes 'capers' ('caper' can be a synonym of 'frolic').
'runs' becomes 'r' (cricket abbreviation).
'off' indicates named letters should be taken away (some letters taken off).
'capers' with 'r' taken out is 'CAPES'.
'in' is the link.
Can you help me to learn more?
(Other definitions for capes that I've seen before include "Short cloaks" , "may be worn" , "Sleeveless cloaks - promontories" , "Space for cloaks" , "Cloaks or headlands" .)