Crossword Genius

Spent lesson getting confused with logs? Neat! (2,4,4,4)

Ross

I believe the answer is:

on ones last legs

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'spent' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'lesson getting confused with logs? neat' is the wordplay.
'getting confused with' indicates an anagram.
'logs'+'neat'='logsneat'
'lesson' mixed up with 'logsneat' gives 'ON ONES LAST LEGS'.

Can you help me to learn more?

(Other definitions for on ones last legs that I've seen before include "Exhausted" , "Near the end of existence" .)

I've seen this clue in The Independent.
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