### Clue: Pull up floors, allowing in Charlie's piledriver (4)
### Answer: SOCK 
 ### Explanation: Definition: piledriver
 **Reversal of**(Pull up, in a down clue) KO'S(slang for "knocks out"/floors/hits someone to unconsciousness) **containing**(allowing in) C(letter represented by "Charlie" in the phonetic alphabet).
Defn: …/a punch as forceful, metaphorically, as a piledriver, and which will floor you.
Answer: Also a piece of clothing.