The most common and most likely answer to this crossword clue is the 2 plus 4 letter word AT MOST
A
T
M
O
S
T
More clues leading to the result AT MOST
- No more than merest jot of Marmite with hot toast
- No more than half the air temperature
- Only source of notes for official film music
- Little influence of surroundings and still less temperature – and there won’t be more!
- 50% of ambience is lost with temperature on generous estimate
- Cash machine supported by cockney entertainer Max
Buddy explains!

The straight part
We know that "generous estimate" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case generous estimate = at most.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.