Crossword Genius

Unaware of son entering game (4,2)

Ross

I believe the answer is:

lost to

'unaware' is the definition.
(thesaurus)

'son entering game' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'entering' indicates putting letters inside.
'game' becomes 'lotto' (the UK National Lottery).
's' put within 'lotto' is 'LOST TO'.

'of' is the link.

(Another definition for lost to that I've seen is " Insensible as far as".)

I've seen this clue in The Telegraph.
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