Lake’s troubled period: why it is losing water? (7)
I believe the answer is:
leakage
'why it is losing water?' is the definition.
I can't judge whether this definition defines the answer.
'lake's troubled period' is the wordplay.
'troubled' indicates an anagram.
'period' becomes 'age' (age is a kind of period).
'lake' with letters rearranged gives 'leak'.
'leak'+'age'='LEAKAGE'
Can you help me to learn more?
(Other definitions for leakage that I've seen before include "Accidental escape (of a liquid or gas)" , "Liquid/gas accidentally lost" , "Gradual escape" , "Escaping liquid or gas" , "Unwanted discharge of fluid" .)