14 which is unclued below, but is clued elsewhere, has to be divided into three components (one a Spanish imperative), each of which is linked with a trio of unclued lights.

Across

1 US soldier with Christmas novelty among my low-value ornaments (11)
7/40 Bowler on Anglo-French 10s (6)
11 Fruit, almost a pound, once topped (6)
13 A liberal ruler admits a palace in Spain (7)
17 They never give up being essayists (6)
18 Fuel vessel having head of heater out of commission (5)
20 Wrong about the girl (6)
21 Large rodent, diffident, on borders of...