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Expresses regret in a little footnote (5)

Ross

I believe the answer is:

weeps

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'expresses regret' is the definition.
Although both the answer and definition are verbs in their -s form, I don't understand how they can define each other.

'a little footnote' is the wordplay.
'a little' becomes 'wee' (I've seen this before).
'footnote' becomes 'PS'.
'wee'+'ps'='WEEPS'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for weeps that I've seen before include "Sheds tears" , "Sobs" .)

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