Supporters mostly go without food around November (4)
I believe the answer is:
fans
'supporters' is the definition.
(fan is a kind of supporter)
'mostly go without food around november' is the wordplay.
'mostly' means to remove the last letter.
'go without food' becomes 'fast' (I've seen this before).
'around' indicates putting letters inside.
'november' becomes 'n' (phonetic alphabet: alpha, bravo, charlie etc.).
'fast' with its final letter taken off is 'fas'.
'fas' enclosing 'n' is 'FANS'.
(Other definitions for fans that I've seen before include "Provokes" , "Enthusiasts" , "Aficionados" , "They create currents of air" , "Ardent followers" .)