Saw show, rhythm and blues initially? (7)

I believe the answer is:

proverb

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'saw' is the definition.
(a saw can mean a proverb or maxim)

'rhythm and blues initially?' is the wordplay.
'rhythm' becomes 'prover' (I am not sure about this - if you are sure you should believe this answer much more).
'and' means one lot of letters go next to another.
'initially?' suggests taking the first letters (I've seen 'initially' mean this).
The first letter of 'blues' is 'b'.
'prover'+'b'='PROVERB'

'show' acts as a link.

Can you help me to learn more?

(Other definitions for proverb that I've seen before include "Old saying, perhaps by Solomon?" , "Wise saying" , "Saying of great truth" , "Saying encapsulating a general truth" , "Short saying embodying a supposed truth" .)

I've seen this clue in The Telegraph.

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