French painter’s right of access (7)

I believe the answer is:

ingress

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'access' is the definition.
(thesaurus)

'french painter's right' is the wordplay.
'french painter' becomes 'ingres' (I've seen this before).
'right' becomes 's' (I am not sure about this - if you are sure you should believe this answer much more).
'ingres'+'s'='INGRESS'

'of' is the link.

Can you help me to learn more?

(Other definitions for ingress that I've seen before include "permission to enter" , "Ribbon-like pasta" , "Means of access" , "Way in" , "right of entry" .)

I've seen this clue in The Times.

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