The most common and most likely answer to this crossword clue is the 6 letter word COSTED
C
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Buddy explains!

The straight part
We know that "Estimated the price" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case estimated the price = costed.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 COSTED mean?
COSTED verb- To incur a charge of; to require payment of a (specified) price.
- To cause something to be lost; to cause the expenditure or relinquishment of.
- To require to be borne or suffered; to cause.
- To calculate or estimate a price.
- Having a specified (type of) cost