Well, peer almost fixed up credit (5)
I believe the answer is:
kudos
'credit' is the definition.
(kudos is recognition or praise for something)
'well peer almost fixed up' is the wordplay.
'well' becomes 'so' (both can mean extremely).
'peer' becomes 'duke' (type of peer).
'almost' means to remove the last letter (most of the word but not all of it).
'fixed up' is a reversal indicator (in a down clue, letters go up).
'so'+'duke'='soduke'
'soduke' with its final letter taken away is 'soduk'.
'soduk' reversed gives 'KUDOS'.
(Other definitions for kudos that I've seen before include "Informal honour of glory" , "Prestige; recognition" , "Great prestige" , "Acclaim" , "Laudation" .)