Leaves singers all at sea (7)

I believe the answer is:

resigns

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'leaves' is the definition.
The answer and definition can be both related to thinking as well as being verbs in their -s form.
Perhaps they are linked in a way I don't understand?

'singers all at sea' is the wordplay.
'all at sea' indicates an anagram.
'singers' with letters rearranged gives 'RESIGNS'.

Can you help me to learn more?

(Other definitions for resigns that I've seen before include "Leaves job voluntarily" , "does the honourable thing" , "abdicates" , "Gives up (a post)" .)

I've seen this clue in The Globe and Mail.

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