Finally reset notice just a little (3)
I believe the answer is:
tad
'a little' is the definition.
(both can mean a small amount)
'finally reset notice' is the wordplay.
'finally' suggests the final letters.
'notice' becomes 'ad' (both can mean an advertisement).
The last letter of 'reset' is 't'.
't'+'ad'='TAD'
'just' is the link.
(Other definitions for tad that I've seen before include "(A) bit, touch" , "Small amount or degree" , "Smidgen" , "little boy" , "Modest amount" .)