Crossword Genius

So about-turn and leave (4)

Ross

I believe the answer is:

ergo

'so' is the definition.
('ergo' can be a synonym of 'so')

'about-turn and leave' is the wordplay.
'about' becomes 're' (regarding**).
'turn' shows that the letters should be reversed in order.
'and' means one lot of letters go next to another.
'leave' becomes 'go'.
're' backwards is 'er'.
'er'+'go'='ERGO'

(Other definitions for ergo that I've seen before include "Therefore (Latin)" , "Thus" , "'Cogito, ---- sum'" , "'Therefore, to the old Romans (4)'" , "It follows" .)

I've seen this clue in the Evening Standard.
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