Small muscles, those found on end of nose (5)
I believe the answer is:
specs
'those found on end of nose' is the definition.
I can't tell whether this defines the answer.
'small muscles' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'muscles' becomes 'pecs' (short for pectoral muscles).
's'+'pecs'='SPECS'
Can you help me to learn more?
(Other definitions for specs that I've seen before include "provider of focus" , "you can see right through them" , "Glasses (abbrev.)" , "Instructions" , "Glasses (abbr)" .)