Pull on earl's coat, which is drier (5)
I believe the answer is:
towel
'is drier' is the definition.
(I've seen this before)
'pull on earl's coat' is the wordplay.
'pull' becomes 'tow' (tow is a kind of pull).
'on' says to put letters next to each other.
'coat' suggests removing the centre (only the letters which coat the word are used).
'earl' with its middle removed is 'el'.
'tow'+'el'='TOWEL'
'which' acts as a link.
(Other definitions for towel that I've seen before include "what sweater needs?" , "Owlet (anag)" , "Drier" , "Piece of absorbent cloth or paper for drying" , "Bathroom item" .)