A professional childless person's right (6)

I believe the answer is:

proper

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'right' is the definition.
(similar in meaning)

'a professional childless person's' is the wordplay.
'a professional' becomes 'pro' ('pro' can be a synonym of 'professional').
'childless person' becomes 'per' (I've seen this in other clues. I am not sure about the 'childless' bit.).
'pro'+'per'='PROPER'

Can you help me to learn more?

(Other definitions for proper that I've seen before include "Conforming to etiquette" , "Actual" , "Suitable and correct" , "Genuine; correct" , "Appropriate or decorous" .)

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