Fold outside of carrier with facility (6)
I believe the answer is:
crease
'fold' is the definition.
(I know that crease is a kind of fold)
'outside of carrier with facility' is the wordplay.
'outside of' says to hollow out the word (remove centre letters) (only letters on the outside of the word).
'with' means one lot of letters go next to another.
'facility' becomes 'ease' (facility can mean ease or absence of difficulty).
'carrier' with its middle taken out is 'cr'.
'cr'+'ease'='CREASE'
(Other definitions for crease that I've seen before include "batsman reaching it" , "Mark on cricket pitch" , "Wrinkle on the cricket pitch?" , "Dagger rarely" , "Line made by folding" .)