Notice in last places one puts up today (4)

I believe the answer is:

espy

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'notice' is the definition.
(I've seen this before)

'last places one puts up today' is the wordplay.
'last' indicates one should take the final letters.
'puts up' shows that the letters should be reversed in order.
'today' becomes 'py' (I can't explain this - if you can you should believe this answer much more).
The last letters of 'places one' are 'se'.
'se' written backwards gives 'es'.
'es'+'py'='ESPY'

'in' is the link.

Can you help me to learn more?

(Other definitions for espy that I've seen before include "Detect" , "Watch" , "Pick out at a distance" , "Spot; observe" , "Discern" .)

I've seen this clue in The Sun.

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