Awfully pleased about an area for walking (9)
I believe the answer is:
esplanade
'area for walking' is the definition.
(walkway by a body of water)
'awfully pleased about an' is the wordplay.
'awfully' indicates anagramming the letters.
'about' indicates putting letters inside.
'pleased' anagrammed gives 'esplade'.
'esplade' placed around 'an' is 'ESPLANADE'.
(Other definitions for esplanade that I've seen before include "Sea-front drive" , "Paved area at seaside resort" , "Seafront walkway" , "Seaside resort walk" , "Walkway beside the seashore" .)