Others take part in fire station (4)
I believe the answer is:
rest
'others' is the definition.
(eg the rest of a group)
'part in fire station' is the wordplay.
'part in' indicates a hidden word.
'REST' is hidden in the letters of 'fire station'.
'take' is the link.
(Other definitions for rest that I've seen before include "Calm" , "Take a breather - (the) others" , "Relaxation" , "Balance" , "Freedom from activity" .)