Mike is suitable and eccentric (6)
I believe the answer is:
misfit
'eccentric' is the definition.
(thesaurus)
'mike is suitable' is the wordplay.
'mike' becomes 'M' (phonetic alphabet: alpha, bravo, charlie etc.).
'suitable' becomes 'fit' (similar in meaning).
'm'+'is'+'fit'='MISFIT'
'and' is the link.
(Other definitions for misfit that I've seen before include "One set apart from others" , "One not suited to environment, odd man out" , "One who is out of place" , "awkward one?" , "Social outcast" .)