Unusually decent boss? Less than ideal (6,4)
I believe the answer is:
second best
'less than ideal' is the definition.
(not the best or ideal)
'unusually decent boss?' is the wordplay.
'unusually' indicates an anagram.
'decent'+'boss'='decentboss'
'decentboss' anagrammed gives 'SECOND-BEST'.
(Other definitions for second best that I've seen before include "Somewhat inferior" , "not the most desirable" , "inferior alternative" , "new Manchester United whizz kid?" , "What footballers might hope to be" .)