Crossword Genius

Died in helping in Canadian sea hazard? (4,3)

Ross

I believe the answer is:

slob ice

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'canadian sea hazard?' is the definition.
The definition suggests a singular noun which matches the answer.

'died in helping' is the wordplay.
'died' becomes 'ob'.
'in' means one lot of letters goes inside another.
'helping' becomes 'slice' (I've seen this before).
'ob' going within 'slice' is 'SLOB ICE'.

'in' is the link.

Can you help me to learn more?

I've seen this clue in The Guardian.
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