Head of government brought down gave a scowl (8)

I believe the answer is:

glowered

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'gave a scowl' is the definition.
Although both the answer and definition are past participle verbs, I don't see how they can define each other.

'head of government brought down' is the wordplay.
'head of' says to take the initial letters.
'brought down' becomes 'lowered' ('lower' can be a synonym of 'bring down').
The first letter of 'government' is 'g'.
'g'+'lowered'='GLOWERED'

Can you help me to learn more?

(Other definitions for glowered that I've seen before include "Showed disapproval" , "Looked furious" , "Scowled" , "Stared angrily" .)

I've seen this clue in The Telegraph.

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