Smallest, hardest

across

1 Normally (abbr) (3)

4 Brotherhood (abbr) (4)

5 Impertinent look (4)

6 Riddle-me-_ _ _ (3)

down

1 Incite (4)

2 Period of low prices (4)

3 Versatile vehicle (Aust) (3)

4 In favour of (3)