Being of a sweet and friendly disposition, I question my proficiency (7)

I believe the answer is:

amiable

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'being of a sweet and friendly disposition' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

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(Other definitions for amiable that I've seen before include "'Friendly, pleasant and good-tempered (7)'" , "'Cordial, friendly (7)'" , "Friendly and good-natured (7)" , "Friendly, kindly" , "Lovable, friendly" .)

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