Corps put up for such corrective treatment (8)

I believe the answer is:

remedial

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'for such corrective treatment' is the definition.
I can't tell whether this definition defines the answer.

'corps put up' is the wordplay.
'corps' becomes 'reme' (Royal Electrical and Mechanical Engineers).
'put' becomes 'laid' (I've seen this before).
'up' says the letters should be written backwards (in down clue: letters go upwards).
'laid' backwards is 'dial'.
'reme'+'dial'='REMEDIAL'

Can you help me to learn more?

(Other definitions for remedial that I've seen before include "special teaching" , "Providing cure or help for disability" , "Providing a cure for disease or deficiency" , "Serving to put right" , "I'm leader of curative sort" .)

I've seen this clue in The Times.

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