Crossword Genius

Mood of small son confronting ’umungous lout? (4)

Ross

I believe the answer is:

sulk

'mood' is the definition.
(sulk is a kind of mood)

I don't understand the remainder of the clue.

(Other definitions for sulk that I've seen before include "Be bad-tempered and sullen" , "Period of bad temper" , "Be silent and resentful" , "Be sullen and ill-tempered" , "Be in a huff" .)

I've seen this clue in The Times.
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