The most common and most likely answer to this crossword clue is the 6 letter word JUMPER
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More clues leading to the result JUMPER
Buddy explains!

The straight part
We know that "Nag/clobber" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case nag/clobber = jumper.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 JUMPER mean?
JUMPER noun- Someone or something that jumps, e.g. a participant in a jumping event in track or skiing.
- A person who attempts suicide by jumping from a great height.
- A short length of electrical conductor, to make a temporary connection. Also jump wire.
- A removable connecting pin on an electronic circuit board.
- A long drilling tool used by masons and quarry workers, consisting of an iron bar with a chisel-edged steel tip at one or both ends, operated by striking it against the rock, turning it slightly with each blow.
- A crude kind of sleigh, usually a simple box on runners which are in one piece with the poles that form the thills.
- A jumping spider
- The larva of the cheese fly.
- (18th century) One of certain Calvinistic Methodists in Wales whose worship was characterized by violent convulsions.
- A spring to impel the star wheel, or a pawl to lock fast a wheel, in a repeating timepiece.
- A shot in which the player releases the ball at the highest point of a jump; a jump shot.
- A nuclear power plant worker who repairs equipment in areas with extremely high levels of radiation.
- To connect with an electrical jumper.
- A woolen sweater or pullover.
- A loose outer jacket, especially one worn by workers and sailors.
- A one-piece, sleeveless dress, or a skirt with straps and a complete or partial bodice, usually worn over a blouse by women and children.
- (usually as jumpers) Rompers.