Pleased with smoke finally clearing (5)
I believe the answer is:
glade
'clearing' is the definition.
(I know that clearing can be written as glade)
'pleased with smoke finally' is the wordplay.
'pleased' becomes 'glad' (similar in meaning).
'with' means one lot of letters go next to another.
'finally' indicates one should take the final letters.
The final letter of 'smoke' is 'e'.
'glad'+'e'='GLADE'
(Other definitions for glade that I've seen before include "An open space in a forest" , "Woodland open space" , "Dell" , "Woodland opening" , "Clearing in wood" .)