Bemoan selfless email circulated by Northern Territory (6)
I believe the answer is:
'bemoan selfless email' is the definition.
'lament' can be an answer for 'bemoan' (synonyms). I'm not sure about the 'selfless email' bit.
'circulated by northern territory' is the wordplay.
'circulated by' becomes 'lame' (I can't justify this - if you can you should give a lot more credence to this answer).
'northern territory' becomes 'nt'.
Can you help me to learn more?
(Other definitions for lament that I've seen before include "Song expressing grief" , "Sad song" , "Mourn (a person's death)" , "Express disappointment" , "Show of sorrow" .)