Taste too much? That's out of order (5)
I believe the answer is:
touch
'taste' is the definition.
(thesaurus)
'too much? that's out of order' is the wordplay.
'that's out of' is a deletion indicator.
'order' becomes 'om' (Order of Merit).
'too'+'much'='toomuch'
'toomuch' with 'om' taken away is 'TOUCH'.
(Other definitions for touch that I've seen before include "Hint" , "Graze" , "off pitch" , "Pinch" , "Come into contact with" .)