Happy suggestions at end of day (5)
I believe the answer is:
tipsy
'happy' is the definition.
(thesaurus)
'suggestions at end of day' is the wordplay.
'suggestions' becomes 'tips' (tip is a kind of suggestion).
'at end of' suggests the final letters.
The final letter of 'day' is 'y'.
'tips'+'y'='TIPSY'
(Other definitions for tipsy that I've seen before include "1 over 8" , "Rather drunk" , "Loaded" , "affected by drink" , "Slightly drunk" .)