Crossword Genius

Barrier to one special female (retired) working for royal mistress (6,7)

Ross

I believe the answer is:

wallis simpson

'royal mistress' is the definition.
(mistress and later wife of Edward VIII)

'barrier to one special female retired working' is the wordplay.
'barrier' becomes 'wall' (a wall acts as a barrier).
'to one' becomes 'i' (Roman numeral).
'special' becomes 'S' (common abbreviation as in Special Air Service).
'female retired working' becomes 'simpson' (I can't explain this - if you can you should believe this answer much more).
'wall'+'i'+'s'+'simpson'='WALLIS SIMPSON'

'for' is the link.

I've seen this clue in The Guardian.
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