Fixed small issue finally: healthy again (7)
I believe the answer is:
secured
'fixed' is the definition.
('secure' can be a synonym of 'fix')
'small issue finally healthy again' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'finally' says to take the final letters.
'healthy again' becomes 'cured'.
The last letter of 'issue' is 'e'.
's'+'e'+'cured'='SECURED'
(Other definitions for secured that I've seen before include "locked up" , "Made firm" , "attached to lead?" , "Protected" , "Made safe or fastened safely" .)