Crossword Genius

Angry son joined forces (7,2)

Ross

I believe the answer is:

steamed up

'angry' is the definition.

'son joined forces' is the wordplay.
'son' becomes 's'.
'joined forces' becomes 'teamedup'.
's'+'teamedup'='STEAMED UP'

(Other definitions for steamed up that I've seen before include "Mad" , "Indignant (colloq.)" , "in a stew" , "window being so opaque" , "Annoyed" .)

I've seen this clue in The Times.
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