The most common and most likely answer to this crossword clue is the 5 letter word GUESS
I've seen this crossword clue in The Times
G
U
E
S
S
More clues leading to the result GUESS
- Party-goer’s setting aside time to have a shot
- Company hasn't time to make suppositions
- Hotel residents having no time for estimate
- Visitors ignoring temperature estimate
- Assume visitors are short of time
- Divine visitor almost succeeded
- Fancy patrons wasting time!
- Gun used excessively, several soldiers initially shot
- Imagine pub’s out of stout
- Suppose great Utopian era seemed stable at first
Buddy explains!

The straight part
We know that "estimate" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case estimate = guess.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 GUESS mean?
GUESS verb- To reach a partly (or totally) unqualified conclusion.
- To solve by a correct conjecture; to conjecture rightly.
- To suppose (introducing a proposition of uncertain plausibility).
- To think, conclude, or decide (without a connotation of uncertainty). Usually in first person: "I guess".
- To hit upon or reproduce by memory.
- A prediction about the outcome of something, typically made without factual evidence or support.