... fine provided, that is, old man gives notice (10,2)
I believe the answer is:
classified ad
'notice' is the definition.
'fine provided that is old man' is the wordplay.
'fine' becomes 'class' (I've seen this before).
'provided' becomes 'if' (eg 'provided it's sunny' means 'if it's sunny').
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'old man' becomes 'dad' (synonyms).
'class'+'if'+'ie'+'dad'='CLASSIFIED AD'
'gives' is the link.
(Other definitions for classified ad that I've seen before include "Newspaper notice" , "Announcement" .)