Smallest, hardest

across

1 Coiled hairstyle (3)

4 Unaccompanied (4)

5 Naval lockup (US) (4)

6 Cereal grain (3)

down

1 Adriatic wind (4)

2 A single thing (4)

3 Subject to bargaining (abbr) (3)

Company takeover (abbr) (3)