The most common and most likely answer to this crossword clue is the 6 letter word DEPUTY
D
E
P
U
T
Y
More clues leading to the result DEPUTY
- Understudy's responsibility to maintain record
- Stand-in sets record in responsibility
- Obligation to accommodate leaders in European Parliament as stand-in official
- Delegate‘s record in service
- Record concealed by tax official
- Record breaking tax results in vice
- Second in command, type due largely to be replaced
- Possibly McDonnell’s task to stifle sources of external pressure
- Substitute with mission to keep record
- Assistant‘s job to get hold of record
Buddy explains!

The straight part
We know that "possibly (John) McDonnell" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case possibly (john) mcdonnell = deputy.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 DEPUTY mean?
DEPUTY noun- One appointed as the substitute of another, and empowered to act for them, in their name or their behalf; a substitute in office
- A person employed to install and remove props, brattices, etc. and to clear gas, for the safety of the miners.
- (France): A member of the Chamber of Deputies, formerly called Corps Législatif
- (Ireland): a member of Dáil Éireann, or the title of a member of Dáil Éireann. (Normally capitalised in both cases)
- (United States): a law enforcement officer who works for the county sheriff's office; a deputy sheriff or sheriff's deputy; the entry level rank in such an agency
- To deputise