Clue: Say 4 getting stripped off 'offensive'? Solutions include each member of such a group with G-strings on (7)
Answer: QUARTET
Explanation: Definition: Solutions include each member of such a group with G-strings on
A charade of [s]QUAR[e] ('say, 4') minus its outer letters ('stripped off') plus TET ('offensive' in the Vietnam war). The 'G-strings' are the lowest strings of a violin.