Crossword Genius

Southeastern gales explosive? You may need these (3-4)

Ross

I believe the answer is:

sea-legs

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'may need these' is the definition.
The definition suggests an adverb but the answer is not.

'southeastern gales explosive?' is the wordplay.
'southeastern' becomes 'SE'.
'explosive?' is an anagram indicator (I've seen 'explosive' mean this).
'gales' with letters rearranged gives 'alegs'.
'se'+'alegs'='SEA-LEGS'

'you' acts as a link.

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