A penny from, as a tip! (4)
I believe the answer is:
apex
'a tip' is the definition.
(I've seen this before)
'a penny from' is the wordplay.
'penny' becomes 'p' (short for pence).
'from' becomes 'ex' ('from' in Latin).
'a'+'p'+'ex'='APEX'
'as' is the link.
(Other definitions for apex that I've seen before include "The highest point or pointed end" , "Topmost point" , "Culmination" , "crown" , "Acme" .)