Crossword Genius

Close to engagement to one man: I touch ring at one point (7)

Ross

I believe the answer is:

tangent

'i touch ring at one point' is the definition.
(a tangent touches a circle or ring)

'close to engagement to one man' is the wordplay.
'close to' is a charade indicator (letters next to each other).
'engagement' becomes 'tan' (I can't explain this - if you can you should give a lot more credence to this answer).
'to one man' becomes 'gent' (gent is a kind of man).
'tan'+'gent' is 'TANGENT'.

(Other definitions for tangent that I've seen before include "Straight line touching a circle" , "Line grazing another" , "Line touching circumference" , "What people often go off at!" , "Particular line" .)

I've seen this clue in The Guardian.
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