Frenchman is tense finding water sprayed (4)
I believe the answer is:
mist
'water sprayed' is the definition.
'frenchman is tense' is the wordplay.
'frenchman' becomes 'm' (abbreviation for Monsieur - like 'Mr').
'tense' becomes 't' (abbreviation used in many dictionaries).
'm'+'is'+'t'='MIST'
'finding' acts as a link.
(Other definitions for mist that I've seen before include "Think fog or low cloud" , "Cloud; thin fog" , "Haze" , "Watery vapour" , "Mizzle; light rain" .)