Hosing edifice prisoners burned (6)

I believe the answer is:

singed

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

'burned' is the definition.
(singing is a kind of burning)

'hosing edifice prisoners' is the wordplay.
'SINGED' is hidden within the letters.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for singed that I've seen before include "Burned by design" , "Burned superficially" , "Scorched" , "Burned slightly at the edges" , "Slightly burned on the surface" .)

I've seen this clue in The Irish Times.

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