Bag carried by fans at Chelsea (7)
I believe the answer is:
satchel
'bag' is the definition.
(I've seen this before)
'carried by fans at chelsea' is the wordplay.
'carried by' indicates a hidden word.
'SATCHEL' can be found hidden inside 'fans at chelsea'.
(Other definitions for satchel that I've seen before include "Schoolbag found in chalets" , "Bag with a strap for books" , "Schoolbag for children's books" , "Text mark for an insertion" , "Bag for school books" .)