Spray from sea or ground round lake (7)
I believe the answer is:
aerosol
'spray' is the definition.
(as in an aerosol spray)
'sea or ground round lake' is the wordplay.
'ground' is an anagram indicator ('grind' the letters into a new form).
'round' becomes 'o' (round can mean a round object).
'lake' becomes 'L' (geographical abbreviation).
'sea'+'or'='seaor'
'seaor' anagrammed gives 'aeros'.
'aeros'+'o'+'l'='AEROSOL'
'from' acts as a link.
(Other definitions for aerosol that I've seen before include "Container with device for releasing contents as fine spray" , "Liquid in a container under pressure" , "A suspension" , "It dispenses liquid in a fine spray" , "O so real (anag.)" .)