Dog that keeps sticking its nose in? (6)
I believe the answer is:
snoopy
'dog that keeps sticking its' is the definition.
'snoopy' can be an answer for 'dog' (I've seen this before). I am unsure of the rest of the definition.
'nose in?' is the wordplay.
'nose' becomes 'snoop' (to snoop is to nose around).
'in?' becomes 'y' (I am not sure about this - if you are sure you should believe this answer much more).
'snoop'+'y'='SNOOPY'
Can you help me to learn more?
(Other definitions for snoopy that I've seen before include "Prying - cartoon dog" , "Cartoon beagle" , "Cartoon character" , "Brown dog's" , "Charlie Brown's canine companion" .)