Chap is working for a blessing (7)

I believe the answer is:

benison

'for a blessing' is the definition.
(benison is a kind of blessing)

'chap is working' is the wordplay.
'chap' becomes 'ben' (man's name).
'working' becomes 'on' (on can mean working or activated).
'ben'+'is'+'on'='BENISON'

(Other definitions for benison that I've seen before include "Thanksgiving" , "Sob, nine turn into a blessing" , "Benediction" .)

I've seen this clue in the Sydney Morning Herald.

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