Fat? Pull everything in (6)
I believe the answer is:
tallow
'fat?' is the definition.
(fat used to make candles)
'pull everything in' is the wordplay.
'pull' becomes 'tow' (tow is a kind of pull).
'everything' becomes 'all' (all things).
'in' indicates putting letters inside.
'tow' placed around 'all' is 'TALLOW'.
(Other definitions for tallow that I've seen before include "Candle grease" , "Candle, soap, fat" , "Rendered fat used for making candles" , "Candle or soap substance" , "Outstanding entertainer" .)