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Service with plenty of weight? (4,4)

Ross

I believe the answer is:

high mass

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This might be a double definition.

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

'plenty of weight?' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'with' is the link.

Can you help me to learn more?

(Other definitions for high mass that I've seen before include "full service" , "Church service celebrated with music, incense etc" .)

I've seen this clue in The Sun.
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