Weeps having lost energy — is the situation so serious? (6)
I believe the answer is:
crisis
'the situation so serious?' is the definition.
I can't tell whether this defines the answer.
'weeps having lost energy is' is the wordplay.
'weeps' becomes 'cries' ('cry' can be a synonym of 'weep').
'having lost' indicates named letters should be taken away.
'energy' becomes 'e' (physics symbol as in E=mc2).
'cries' with 'e' taken away is 'cris'.
'cris'+'is'='CRISIS'
Can you help me to learn more?
(Other definitions for crisis that I've seen before include "Emergency (in midlife?)" , "Period of dire trouble" , "Climax, breaking point" , "Climax or turning point as in fever" , "Moment of danger" .)