Great clues as always. I don’t always get a chance to look in but whenever I do they never disappoint.
My suggestions are:
1. Superstitious relations and long-standing union members have picked up tails (3,5,5) OLD WIVES TALES. Superstitious relations- def. Long standing relations- Old wives. Tails picked up as in heard gives tales.
2. Apocalyptical policy is abandoned prior to working for US and Japanese grower (7) CATALPA Anagram of apocalyptical less policy. Catalpa is a plant in US and Japan.
3. Former cooking utensil with dangerous casing blows up (7) EXPANDS, Old- Ex- utensil- pan + DS (the outside letters or casing of dangerous)
4. A timid person wouldn't express disapproval towards a foolish person (3,3,2,1,5) SAY BOO TO A GOOSE. Express disapproval= boo towards a foolish person= to a goose. The overall phrase is something a timid person wouldn’t do.
5. A queer dialect variant holds the first four together (1,6) A QUATRE . A + Quare (queer dialect variant according to Chambers) with T (the first letter of ‘the’ inside). Definition the first four together.