Boat at sea in secure area offering fuel (4,3)

I believe the answer is:

peat bog

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'area offering fuel' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'boat at sea in secure' is the wordplay.
'at sea' is an anagram indicator.
'in' is an insertion indicator.
'secure' becomes 'peg'.
'boat' with letters rearranged gives 'atbo'.
'atbo' inserted into 'peg' is 'PEAT-BOG'.

Can you help me to learn more?

(Other definitions for peat bog that I've seen before include "Wet spongy ground, cut and dried for fuel" , "marshy land" .)

I've seen this clue in The Sun.

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