Crossword Genius

Assess too low, but aunt erred badly (9)

Ross

I believe the answer is:

underrate

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'assess too low' is the definition.
I can't tell whether this definition defines the answer.

'aunt erred badly' is the wordplay.
'badly' is an anagram indicator.
'aunt'+'erred'='aunterred'
'aunterred' with letters rearranged gives 'UNDERRATE'.

'but' acts as a link.

Can you help me to learn more?

(Other definitions for underrate that I've seen before include "Endure art, think of too little value" , "Value insufficiently, think too little of" , "Not value enough" , "Think too little of, fail to appreciate" , "Have too low an opinion of" .)

I've seen this clue in the Sydney Morning Herald.
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