Kind chap, extremely likeable (6)
I believe the answer is:
gentle
'kind' is the definition.
(I've seen this before)
'chap extremely likeable' is the wordplay.
'chap' becomes 'gent' (both can mean a man).
'extremely' suggests removing the centre (only the extremes of the word are used).
'likeable' with its centre taken out is 'le'.
'gent'+'le'='GENTLE'
(Other definitions for gentle that I've seen before include "Not stern, coarse or violent" , "Not harsh or violent" , "Mild, not rough" , "Jane Eyre's kind person with a book? -- eternal greed (anag)" , "'Do not go ... into that good night'/Thomas" .)