Minor disagreement (11)
There are a few possibilities for this:
contretemps
'minor disagreement' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for contretemps that I've seen before include "Awkward occurrence or situation" , "Unexpected embarrassment" , "Prescott men (anag) - awkward moment" , "Awkward clash" , "difficult situation" .)
'minor disagreement' is the definition.
(a spat is a disagreement or argument)
This is all the clue.
(Other definitions for spat that I've seen before include "Slight argument" , "Ejected saliva from the mouth" , "Row; discharged" , "Observed" , "Old leg wear - brief quarrel" .)
(Other definitions for tiff that I've seen before include "Minor squabble" , "Minor argument" , "Slight quarrel" , "A spat or small row" , "pet" .)