Partly seen — as always on the nose (5)
I believe the answer is:
nasal
'the nose' is the definition.
The definition and answer can be both body parts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'partly seen as always' is the wordplay.
'partly' says the answer is hidden in the clue.
'NASAL' is hidden within 'seen as always'.
'on' acts as a link.
Can you help me to learn more?
(Other definitions for nasal that I've seen before include "Relating to the nose" , "Like a twang" , "Like sounds of m, n, ng" , "To do with nose, say sound" , "piece of armour" .)