Upset by the boss, becomes emotional (4)

I believe the answer is:

sobs

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'becomes emotional' is the definition.
I can't tell whether this defines the answer.

'upset by the boss' is the wordplay.
'upset by' indicates an anagram.
'boss' with letters rearranged gives 'SOBS'.

Can you help me to learn more?

(Other definitions for sobs that I've seen before include "Weeps noisily" , "Given evidence of distress" , "Weeps heavily (4)" , "Weeps audibly" , "Cries loudly" .)

I've seen this clue in the Evening Standard.

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