The most common and most likely answer to this crossword clue is the 7 letter word SWEATER
I've seen this crossword clue in Financial Times
S
W
E
A
T
E
R
More clues leading to the result SWEATER
- Top person in sauna?
- Clobber person in a sauna?
- Consumer's after small western pullover
- South western diner's warm clothing
- After first sign of snow, we rate knitted jumper
- Singular set of clothing, including oddly twee pullover
- One visibly too hot for this garment
- Top Swedish diner
- Jersey not as dry, we hear, after beginning of September
- Is one hot in sun? Conditions not hot
Buddy explains!

The straight part
We know that "Jersey" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case jersey = sweater.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 SWEATER mean?
SWEATER noun- A knitted jacket or jersey, usually of thick wool, worn by athletes before or after exercise.
- A similar garment worn for warmth.
- One who sweats (produces sweat).
- One who or that which causes to sweat.
- A diaphoretic remedy.
- A middleman who subcontracted piece work in the tailoring trade.
- One who sweats coins, i.e. removes small portions by shaking them.
- A London street ruffian in Queen Anne's time who prodded weak passengers with his sword-point.
- To dress in a sweater.