The full value of a horse (6)

I believe the answer is:

amount

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'the full value' is the definition.
'amount' can be an answer for 'value' (I've seen this before). I'm not certain of the 'the full' bit.

'a horse' is the wordplay.
'horse' becomes 'mount' (mount is a kind of horse).
'a'+'mount'='AMOUNT'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for amount that I've seen before include "Total or extent" , "Add up or be equivalent to" , "Sum of money" , "Size" , "Supply" .)

I've seen this clue in The Independent.

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