Abbreviated state service (4)

I believe the answer is:

mass

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This could be a double definition.

'abbreviated state' is the first definition.
'mass' can be an answer for 'state' (abbreviation for Massachusetts). I am not certain of the 'abbreviated' bit.

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

Can you help me to learn more?

(Other definitions for mass that I've seen before include "Lots of people" , "Roman Catholic service" , "13 [BULK]" , "Rite; quantity of matter" , "Matter; large amount" .)

I've seen this clue in The Times.

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