A sport for men releasing energy repeatedly? Something mixed on offer here (7)

I believe the answer is:

amalgam

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'something mixed on offer here' is the definition.
(an amalgam is a mixture)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for amalgam that I've seen before include "Blend of metals" , "Blend of diverse things" , "Mixture, blend" , "Ring-bearing hobbit" , "Alloy of mercury and another metal" .)

I've seen this clue in The Independent.

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