See increases coming at critical moments (6)
I believe the answer is:
crises
'moments' is the definition.
(I have seen 'difficult moments' mean 'crises' so perhaps 'moments' could also mean 'crises')
'see increases' is the wordplay.
'see' becomes 'C' (the word for the letter, according to Chambers).
'increases' becomes 'rises' (rise is a kind of increase).
'c'+'rises'='CRISES'
'coming at critical' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for crises that I've seen before include "Catastrophes" , "moments of disaster" , "Moments of panic" , "Crucial stages or unstable situations of difficulty" , "Times of great danger" .)