Lamps used for writing a hymn (5)

I believe the answer is:

psalm

I'm a little stuck... Click here to teach me more about this clue!

'hymn' is the definition.
(type of hymn)

'lamps used for writing a' is the wordplay.
'lamps' anagrams to 'PSALM'.
Though, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for psalm that I've seen before include "Devotional hymn or song" , "Jewish hymn" , "Religious song" , "Devotional song/hymn" , "Sacred poem (written by King David?)" .)

I've seen this clue in The Irish Independent.

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