Coin going with shillings to make a group (7)
I believe the answer is:
species
'make a group' is the definition.
'species' can be an answer for 'make' (thesaurus). I am unsure of the 'a group' bit.
'coin going with shillings' is the wordplay.
'coin' becomes 'specie' (term for coined money).
'going with' says to put letters next to each other.
'shillings' becomes 's'.
'specie'+'s'='SPECIES'
'to' is the link.
(Other definitions for species that I've seen before include "Kind of creature" , "Sort, type" , "Taxonomic grouping" , "Taxonomic group capable of interbreeding" , "Groups of related plants or animals" .)