Mixing treacle with no patience (9)
I believe the answer is:
tolerance
'patience' is the definition.
(I've seen this before)
'mixing treacle with no' is the wordplay.
'mixing' indicates an anagram.
'with' means one lot of letters go next to another.
'treacle' after 'no' is 'notreacle'.
'notreacle' is an anagram of 'TOLERANCE'.
(Other definitions for tolerance that I've seen before include "Ability to stomach (something)" , "Understanding" , "Ability to resist pain" , "ecumenical spirit?" , "Indulgence" .)