4d Menhaden (fish) - 'men had' + 'e(aster)n' (gutted)
12a Abstinent - 'absent' (gone, without; around) 'tin' (can)
19a Doldrums - 'D (note) old rums'
25a Jacaranda - 'c(irc)a' (about, in) 'jar' + 'and (with) a'
27a Analyst - '(C)anal St' (no 'c[lubs]' to open) (to admit) 'y' (unknown)