Councillor is repeatedly in big trouble (6)
I believe the answer is:
crisis
'big trouble' is the definition.
'crisis' can be an answer for 'trouble'. I'm not sure about the 'big' bit.
'councillor is repeatedly' is the wordplay.
'councillor' becomes 'cr' (I've seen this in other clues).
'repeatedly' says to double the letters.
'is' duplicated is 'isis'.
'cr'+'isis'='CRISIS'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for crisis that I've seen before include "Emergency - decision time" , "Climax point in, say, a fever" , "Crucial stage in a series of events" , "Calamity" , "Climacteric" .)