Guys in a fix ultimately sought change (9)
I believe the answer is:
amendment
'change' is the definition.
(amendment is a kind of change)
'guys in a fix ultimately sought' is the wordplay.
'guys' becomes 'men' (guy can mean a man).
'in' is an insertion indicator.
'a fix' becomes 'amend' (to amend is to fix or sort out).
'ultimately' suggests the final letters.
The last letter of 'sought' is 't'.
'amend'+'t'='amendt'
'men' inserted within 'amendt' is 'AMENDMENT'.
(Other definitions for amendment that I've seen before include "the fifth one benefiting Uncle Sam's defendants?" , "Statement added to or revising a document" , "change for the better" , "a bit of a change!" , "Revision" .)