Councillor conceals difficult situation, leading to ill humour (6)
I believe the answer is:
choler
'ill humour' is the definition.
'choler' can be an answer for 'humour' (I have seen 'bad humour' mean 'choler' so perhaps 'humour' could also mean 'choler'). I am not sure about the 'ill' bit.
'councillor conceals difficult situation' is the wordplay.
'councillor' becomes 'cr' (I've seen this in other clues).
'conceals' indicates putting letters inside.
'difficult situation' becomes 'hole'.
'cr' placed around 'hole' is 'CHOLER'.
'leading to' is the link.
Can you help me to learn more?
(Other definitions for choler that I've seen before include "Irascibility" , "ill-humour" , "Bile, bad temper" , "bad humour" , "Irritability, anger" .)