Principles including tenets principally for us? (7)
I believe the answer is:
mortals
'us?' is the definition.
Although both the answer and definition are plural nouns, I cannot understand how they can define each other.
'principles including tenets principally' is the wordplay.
'principles' becomes 'morals' (I've seen this in another clue).
'including' means one lot of letters goes inside another.
'tenets principally' becomes 't' (I can't justify this - if you can you should give a lot more credence to this answer).
'morals' going around 't' is 'MORTALS'.
'for' is the link.
Can you help me to learn more?
(Other definitions for mortals that I've seen before include "People - lost arm (anag)" , "Lord, what fools these -- be! (AMND)" .)