Dominance shown, quick to maintain edge (7)

I believe the answer is:

primacy

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'dominance' is the definition.
(I've seen this before)

'quick to maintain edge' is the wordplay.
'quick' becomes 'pacy'.
'to maintain' indicates putting letters inside.
'edge' becomes 'rim' (rim is a kind of edge).
'pacy' going around 'rim' is 'PRIMACY'.

'shown' is the link.
I am not very happy about this link. It may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for primacy that I've seen before include "first place" , "Dominance" , "precedence" .)

I've seen this clue in The Telegraph.

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