Skill in finding some nick-nacks (5)
I believe the answer is:
knack
'skill in finding' is the definition.
'knack' can be an answer for 'skill' (I have seen 'Instinctive skill' mean 'knack' so perhaps 'skill' could also mean 'knack'). I'm not sure about the 'in finding' bit.
'some nick-nacks' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'KNACK' can be found hidden inside 'nick nacks'.
Can you help me to learn more?
(Other definitions for knack that I've seen before include "Particular talent" , "Technique" , "Special ability" , "Skilful competence" , "Natural ability" .)