The most common and most likely answer to this crossword clue is the 6 letter word REHEEL
R
E
H
E
E
L
Buddy explains!
The straight part
We know that "Service (as in some bars" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case service (as in some bars = reheel.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 REHEEL mean?
REHEEL verb- To fit (a shoe, stocking, etc.) with a replacement heel.