Likeable chap and swing pioneer (7)

I believe the answer is:

goodman

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'swing pioneer' is the definition.
The definition suggests a singular noun which matches the answer.

'likeable chap' is the wordplay.
'likeable' becomes 'good' (I can't explain this - if you can you should believe this answer much more).
'chap' becomes 'man' (chap can mean a man).
'good'+'man'='GOODMAN'

'and' acts as a link.

Can you help me to learn more?

(Other definitions for goodman that I've seen before include "Benny ___ , 'King of Swing'" , "Jazz musician" , "jazz player" .)

I've seen this clue in The Sun.

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