New lamps put into service (5)

I believe the answer is:

psalm

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'service' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'new lamps' is the wordplay.
'new' is an anagram indicator.
'lamps' anagrammed gives 'PSALM'.

'put into' is the link.

Can you help me to learn more?

(Other definitions for psalm that I've seen before include "OT hymn" , "Church song" , "Jewish hymn" , "Sacred song or hymn" , "What's heard in church" .)

I've seen this clue in The Globe and Mail.

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