Club providing many a service (4)
I believe the answer is:
mace
'club' is the definition.
(thesaurus)
'many a service' is the wordplay.
'many' becomes 'm' (**).
'a service' becomes 'ace' (ace is a kind of service).
'm'+'ace'='MACE'
'providing' acts as a link.
(Other definitions for mace that I've seen before include "Staff of office and a spice" , "Came to find ceremonial staff" , "Staff of office for a flavouring" , "Medieval weapon or kind of spice" , "put on the rack?" .)