Some Aberdeen terriers go inside (5)
I believe the answer is:
enter
'go inside' is the definition.
(I've seen this in another clue)
'some aberdeen terriers' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'ENTER' is hidden in the letters of 'aberdeen terriers'.
(Other definitions for enter that I've seen before include "cross the threshold" , "Enrol" , "Fill in" , "Register (as a competitor)" , "Fruit drink" .)