They may offer you protection inside boat after storm (10)

I believe the answer is:

antibodies

'they may offer you protection' is the definition.
(protection against infections)

'inside boat after storm' is the wordplay.
'after' is a charade indicator (letters next to each other).
'storm' is an anagram indicator.
'inside'+'boat'='insideboat'
'insideboat' anagrammed gives 'ANTIBODIES'.

(Another definition for antibodies that I've seen is " they're supposed to eradicate disease".)

I've seen this clue in The Telegraph.

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