It's always Sarah going round with a group (7)
I believe the answer is:
several
'it's always sarah going round with a group' is the definition.
I can't tell whether this definition defines the answer.
'it's always sarah going round' is the wordplay.
'it's always' becomes 'ever' (synonyms).
'sarah' becomes 'Sal' (Sally is a common pet form of Sarah).
'going round' is an insertion indicator.
'ever' going within 'sal' is 'SEVERAL'.
Can you help me to learn more?
(Other definitions for several that I've seen before include "Sundry, distinct" , "A few; separate" , "A good few" , "Indefinite number more than two or three, but not many" , "More than one or two" .)