The most common and most likely answer to this crossword clue is the 8 letter word SUBTOTAL
I've seen this crossword clue in The Guardian
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More clues leading to the result SUBTOTAL
Buddy explains!
The straight part
We know that "not the full amount" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not the full amount = subtotal.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SUBTOTAL mean?
SUBTOTAL noun- The total for a part of a list of numbers being summed.
- To calculate a subtotal.
- Less than total; partial.