1d) Time to marry engaging popular bachelor; retiring here? (4,3)
2d) A cold remark's got Phil worried about son's talents (15)
5d) Royals are dispersed in time of revolution (5,4)
13a) Estuary is behind Charlie (5)
16d) Humidity stifles community - up sticks (6)
Sorry for no letters. All help much appreciated
I believe it is an Americanism. "Trad Jazz is my bag" (Interest) reversed to make gab=chat
Behind is a posterior(bum .vulg) and to bum is to scrounge or SPONGE