The most common and most likely answer to this crossword clue is the 6 letter word ERNEST
I've seen this crossword clue in Independent
E
R
N
E
S
T
More clues leading to the result ERNEST
Buddy explains!
The straight part
We know that "with time to follow the 20 (6)" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case with time to follow the 20 (6) = ernest.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.