Thin as a lip, but thinner in the nose (5)
I believe the answer is:
nasal
'in the nose' is the definition.
(I've seen this before)
'thin as a lip but thinner' is the wordplay.
'NASAL' is hidden in amongst the letters.
However, I am not sure how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for nasal that I've seen before include "Sounding affected by cold" , "Relating to one's hooter" , "Twangy" , "regarding the nose" , "of central feature" .)