The most common and most likely answer to this crossword clue is the 4 letter word TEGG
T
E
G
G
More clues leading to the result TEGG
Buddy explains!
The straight part
We know that "Fleece? Mine gets temperature hoisted (4)" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fleece? mine gets temperature hoisted (4) = tegg.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.