Crossword Genius

Farewell a son provided (2,4,2)

Ross

I believe the answer is:

so long as

'provided' is the definition.
(both can mean under specified conditions)

'farewell a son' is the wordplay.
'farewell' becomes 'so long' (so long is a kind of farewell).
'son' becomes 's' (genealogical abbreviation for son).
'solong'+'a'+'s'='SO LONG AS'

(Another definition for so long as that I've seen is " Provided".)

I've seen this clue in The Independent.
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