Hydroelectric project that's ridiculous, hardly wet (7)
I believe the answer is:
dampish
'hardly wet' is the definition.
'dampish' can be an answer for 'wet' (similar in meaning). I am not sure about the 'hardly' bit.
'hydroelectric project that's ridiculous' is the wordplay.
'hydroelectric project' becomes 'dam' (I've seen this in another clue).
'that's ridiculous' becomes 'pish' (I am not sure about this - if you are sure you should believe this answer much more).
'dam'+'pish'='DAMPISH'
Can you help me to learn more?
(Other definitions for dampish that I've seen before include "Somewhat wet" , "rather wet" , "quite wet" .)