Crossword Genius

Estimation of beasts with about a thousand delivered (10)

Ross

I believe the answer is:

assessment

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

'beasts with about a thousand delivered' is the wordplay.
'beasts with' becomes 'asses' (I can't justify this - if you can you should give a lot more credence to this answer).
'about' means one lot of letters goes inside another.
'a thousand' becomes 'M' (Roman numeral for a thousand).
'delivered' becomes 'sent' (I've seen this in another clue).
'm' inserted into 'sent' is 'sment'.
'asses'+'sment'='ASSESSMENT'

'of' is the link.

Can you help me to learn more?

(Other definitions for assessment that I've seen before include "Review" , "Appraisal" , "Opinion" , "test" , "Evaluation, estimation" .)

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