A memo about the tender (8)

I believe the answer is:

reminder

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'a memo' is the definition.
(thesaurus)

'about the tender' is the wordplay.
'about' becomes 're' (regarding).
'the tender' becomes 'minder' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
're'+'minder'='REMINDER'

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(Other definitions for reminder that I've seen before include "Memory refresher" , "Memory jogger" , "Memory-jogger" , "Prompt, memory jog" , "Aide-mmoire" .)

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