Crossword Genius

Two unidentical sons, flipping hooligans! (4)

Ross

I believe the answer is:

yobs

I'm a little stuck... Click here to teach me more about this clue!

'hooligans' is the definition.
('yob' can be a synonym of 'hooligan')

'two unidentical sons flipping' is the wordplay.
I cannot really see how this works, but
'sons' could be 's' and 's' is present in the answer.
The remaining letters 'yob' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for yobs that I've seen before include "aggressive teenagers" , "Louts" , "Boys who are hooligans" .)

I've seen this clue in The Guardian.
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