Crossword Genius

Song about bloody American upset serviceman? (3,6)

Ross

I believe the answer is:

lay reader

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

'american upset serviceman?' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'song about bloody' is the wordplay.
'song' becomes 'lay' (lay is a kind of song).
'about bloody' becomes 'reader' (I can't justify this - if you can you should give a lot more credence to this answer).
'lay'+'reader'='LAY READER'

Can you help me to learn more?

(Other definitions for lay reader that I've seen before include "assistant to minister" , "Unordained preacher" , "Non-ordained person undertaking church duties" , "volunteer for service?" , "who may give lessons" .)

I've seen this clue in The Guardian.
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