Heads learn it's unusual (8)

I believe the answer is:

latrines

'heads' is the definition.
(I've seen this in another clue)

'learn it's unusual' is the wordplay.
'unusual' indicates anagramming the letters.
'learn'+'its'='learnits'
'learnits' is an anagram of 'LATRINES'.

(Other definitions for latrines that I've seen before include "Entrails of military loos" , "toilets" .)

I've seen this clue in The Guardian.

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