2643: Word-building

The unclued lights may be arranged to form a chain of words from three to eleven letters in length, each one being an anagram of its predecessor and one additional letter. One of these lights is hyphened. Elsewhere ignore an acute accent.

Across

1    Radio show for impressionists no longer in the belfry (4,7)

11    Singer mirroring resounding soccer victory (6)

13    Delving into information, understands about saving (4,3)

15    Gang featured in Panama fiasco (5)

16    Small growth on head trimmed (5)

17    Showy decoration’s not new (6)

18    Disinclined to move back from centre, nightly (5)

21    Party craving senior member (5)

22    Mark follows sailor not to vote (7)

27    Australia tried...