Crossword Genius

Convince son to invest in a safe (6)

Ross

I believe the answer is:

assure

'convince' is the definition.
('assure' can be a synonym of 'convince')

'son to invest in a safe' is the wordplay.
'son' becomes 's'.
'to invest in' means one lot of letters goes inside another.
'safe' becomes 'sure' (I've seen this before).
'a'+'sure'='asure'
's' placed inside 'asure' is 'ASSURE'.

(Other definitions for assure that I've seen before include "Give confidence to" , "Tell positively" , "Cover by life insurance" , "Cover with a policy" , "Make (something) certain to happen" .)

I've seen this clue in The Independent.
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