Crossword Genius

When psalms wave or lamps flicker, the effect's poetic (5)

Ross

I believe the answer is:

psalm

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

'when psalms wave' is the definition.
I can't tell whether this defines the answer.

'lamps flicker the effect's poetic' is the wordplay.
'lamps' can be anagrammed to 'PSALM'.
But, I am not clear how the anagram is indicated.

'or' acts as a link.

Can you help me to learn more?

(Other definitions for psalm that I've seen before include "Palms (anag.)" , "Church song" , "Lamps for a sacred song" , "Sacred poem (written by King David?)" , "Religious chant" .)

I've seen this clue in the Evening Standard.
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