Look angry enough to bring a gang leader down (6)

I believe the answer is:

glower

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'look angry enough' is the definition.
'glower' can be an answer for 'look' (I have seen 'Sullen look ' mean 'glower' so perhaps 'look' could also mean 'glower'). I also know that 'angry' relates to this answer.

'a gang leader down' is the wordplay.
'leader' suggests taking the first letters.
'down' becomes 'lower' (synonyms).
The initial letter of 'gang' is 'g'.
'g'+'lower'='GLOWER'

'to bring' is the link.

Can you help me to learn more?

(Other definitions for glower that I've seen before include "shiner?" , "burning ember, say?" , "Look hotly or angrily" , "Angry and sullen look" , "Frown" .)

I've seen this clue in the Evening Standard.

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