Point to a little dog in pack (4,2)
I believe the answer is:
stop up
'pack' is the definition.
(thesaurus)
'point to a little dog in' is the wordplay.
'point' becomes 'stop' (synonyms).
'to a little' means to remove the last letter (the word is not quite complete).
'dog' becomes 'pug' (pug is a kind of dog).
'in' is an insertion indicator.
'pug' with its last letter removed is 'pu'.
'stop' placed around 'pu' is 'STOP UP'.
(Other definitions for stop up that I've seen before include "Cork" , "Don't retire here" , "Block (eg an earth)" , "Don't go to bed early" , "close" .)