A thousand in disheartened crew perished at sea thus? (11)

I believe the answer is:

shipwrecked

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'a thousand' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'in disheartened crew perished at sea thus?' is the wordplay.
I cannot quite understand how this works, but
'in' could be 'hip' (both can mean fashionable) and 'hip' is present in the answer.
an anagram of 'crew' is 'wrec' which is within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Times.

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