Yen to punch sweet Hoskins? Good grief! (5,2)

I believe the answer is:

deary me

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'good grief' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'yen to punch sweet hoskins?' is the wordplay.
'yen' becomes 'y' (resembles the symbol for the currency of Japan).
'to punch' indicates putting letters inside (some letters punch a hole in others).
'sweet' becomes 'dear' (both are terms of endearment).
'hoskins?' becomes 'me' (where the crossword setter is 'Hoskins').
'dear'+'me'='dearme'
'y' inserted within 'dearme' is 'DEARY ME'.

Can you help me to learn more?

(Another definition for deary me that I've seen is " I'm surprised".)

I've seen this clue in The Independent.

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